### Description
This adds a close button to the paywall that can be displayed when using
the `Paywall` composable, the `PaywallDialog` or the
`PaywallActivityLauncher`.

![image](https://github.com/RevenueCat/purchases-android/assets/808417/8bb00201-6d1f-45a5-a6cd-8d8cbb241a03)

### New Features
#### ✨📱 Introducing Android Paywalls 🐾🧱

RevenueCat's Paywalls allow you to remotely configure your entire
paywall view without any code changes or app updates.
Our paywall templates use native code to deliver smooth, intuitive
experiences to your customers when you’re ready to deliver them an
Offering; and you can use our Dashboard to pick the right template and
configuration to meet your needs.

To use RevenueCat Paywalls on Android, simply:

1. Create a Paywall on the Dashboard for the `Offering` you intend to
serve to your customers
2. Add the `RevenueCatUI` dependency to your project:
```groovy build.gradle
implementation 'com.revenuecat.purchases:purchases:7.1.0'
implementation 'com.revenuecat.purchases:purchases-ui:7.1.0'
```
3. Display a paywall:
```kotlin
@OptIn(ExperimentalPreviewRevenueCatUIPurchasesAPI::class)
@composable
private fun LockedScreen() {
    YourContent()

    PaywallDialog(
        PaywallDialogOptions.Builder()
            .setRequiredEntitlementIdentifier(Constants.ENTITLEMENT_ID)
            .build()
    )
}
```

> **Note**
> Android paywalls is currently behind an experimental flag:
`ExperimentalPreviewRevenueCatUIPurchasesAPI`.
> It is safe to release app updates with it. We guarantee that paywalls
will continue to work and any changes will always be backwards
compatible.
> They are stable, but migration steps may be required in the future.
We'll do our best to minimize any changes you have to make.

You can find more information in [our
documentation](https://rev.cat/paywalls).

<details>

<summary>List of changes</summary>

* `Paywalls`: Improve PaywallDialog look on tablets (#1419) via Toni
Rico (@tonidero)
* `Paywalls`: disallow Markdown links in PurchaseButton (#1421) via
NachoSoto (@NachoSoto)
* `Paywalls`: implemented template 5 (#1412) via NachoSoto (@NachoSoto)
* `Paywalls`: Fix wrong view model data after configuration changes
(#1417) via Toni Rico (@tonidero)
* `Paywalls`: update template 4 colors (#1410) via NachoSoto
(@NachoSoto)
* `Paywalls`: Add bundled font to paywall tester (#1415) via Toni Rico
(@tonidero)
* `Paywalls`: Fix purchase button text flashing when changing selected
package (#1416) via Toni Rico (@tonidero)
* `Paywalls`: support text3 and accent3 colors (#1409) via NachoSoto
(@NachoSoto)
* `Paywalls`: PaywallData errors shouldn't make Offerings fail to decode
(#1402) via NachoSoto (@NachoSoto)
* `Paywalls`: convert empty strings to null via NachoSoto (@NachoSoto)
* `Paywalls`: footer view should not render background image via
NachoSoto (@NachoSoto)
* `Paywalls`: improve template 4 A11y support via NachoSoto (@NachoSoto)
* `Paywalls`: Add close button option (#1390) via Toni Rico (@tonidero)
* `Paywalls`: fix MarkdownText stealing touches from package buttons
(#1411) via NachoSoto (@NachoSoto)
* Fix onDismiss getting called twice in PaywallDialogs (#1408) via Cesar
de la Vega (@vegaro)
* `Paywalls`: ignore URL deserialization errors (#1399) via NachoSoto
(@NachoSoto)
* Animate transition between loading and loaded paywall (#1404) via
Cesar de la Vega (@vegaro)
* Fix button padding in Loading paywall (#1405) via Cesar de la Vega
(@vegaro)
* Add test for `packageInfo.localizedDiscount` (#1407) via Cesar de la
Vega (@vegaro)
* `Paywalls`: RemoteImage always renders a placeholder on previews via
NachoSoto (@NachoSoto)
* `Paywalls`: decode empty images as null via NachoSoto (@NachoSoto)
* `Paywalls`: Allow trigger manual paywall tester release (#1406) via
Toni Rico (@tonidero)
* Fix navigation after closing paywall in Paywalls screen (#1403) via
Cesar de la Vega (@vegaro)
* `Paywalls`: Add experimental annotation to all public APIs in
RevenueCat UI (#1400) via Toni Rico (@tonidero)
* `Paywalls`: improve template 2 layout (#1396) via NachoSoto
(@NachoSoto)
* `Paywalls`: template 4 (#1349) via NachoSoto (@NachoSoto)
* `Paywalls`: fix template 3 offer details color (#1394) via NachoSoto
(@NachoSoto)
* `Paywalls`: PaywallDialogOptions no longer requires dismissRequest
(#1386) via NachoSoto (@NachoSoto)
* `Paywalls`: fixed accessibility across templates (#1392) via NachoSoto
(@NachoSoto)
* `Paywalls`: increase PaywallBackground blur radius to match iOS via
NachoSoto (@NachoSoto)
* `Paywalls`: use LocalUriHandler for opening links (#1388) via
NachoSoto (@NachoSoto)
* `Paywalls`: support for Markdown links (#1387) via NachoSoto
(@NachoSoto)
* `Paywalls`: display purchase/restore errors (#1384) via NachoSoto
(@NachoSoto)
* `Paywalls`: improve error handling (#1383) via NachoSoto (@NachoSoto)
* `Paywalls`: fixed incorrect background on footer (#1382) via NachoSoto
(@NachoSoto)
* `Paywalls`: fix backwards-compatible blurring of default paywall
background (#1380) via NachoSoto (@NachoSoto)
* `Paywalls`: polish template 2 spacing (#1381) via NachoSoto
(@NachoSoto)
* `Paywalls`: optimize backwards compatible blurring (#1379) via
NachoSoto (@NachoSoto)
* `Paywalls`: Predownload offering images if paywalls sdk exists (#1372)
via Toni Rico (@tonidero)
* `Paywalls`: PurchaseButton supports gradients (#1378) via NachoSoto
(@NachoSoto)
* `Paywalls`: optimize AdaptiveComposable (#1377) via NachoSoto
(@NachoSoto)
* `Paywalls`: improve FooterDialog corner radius (#1374) via NachoSoto
(@NachoSoto)
* `Paywalls`: optimize PurchaseButton (#1376) via NachoSoto (@NachoSoto)
* `Paywalls`: Enable footer modes in paywall tester paywalls tab (#1368)
via Toni Rico (@tonidero)
* `Paywalls`: Support footer in template 3 (#1367) via Toni Rico
(@tonidero)
* `Paywalls`: calculate discountRelativeToMostExpensivePerMonth (#1370)
via NachoSoto (@NachoSoto)
* `Paywalls`: Add offer details in template 2 when in condensed form
(#1371) via Toni Rico (@tonidero)
* `Paywalls`: improve handling of lifetime/custom packages (#1363) via
NachoSoto (@NachoSoto)
* `Paywalls`: Support footer in template 1 (#1366) via Toni Rico
(@tonidero)
* Add `StoreProduct.pricePerMonth` (#1369) via NachoSoto (@NachoSoto)
* `Paywalls`: Support condensed footer presentation in template 2
(#1365) via Toni Rico (@tonidero)
* `Paywalls`: finished localization support (#1362) via NachoSoto
(@NachoSoto)
* `Paywalls`: backwards compatible blurring (#1327) via Andy Boedo
(@AndyBoedo)
* `Paywalls`: PaywallViewModel tests (#1357) via NachoSoto (@NachoSoto)
* `Paywalls`: improve LoadingPaywall (#1364) via NachoSoto (@NachoSoto)
* `Paywalls`: Fix paywall compose previews (#1360) via Toni Rico
(@tonidero)
* `Paywalls`: Fix proguard rules kotlinx serialization (#1356) via Toni
Rico (@tonidero)
* `Paywalls`: Add custom font example to paywalls screen (#1358) via
Toni Rico (@tonidero)
* `Paywalls`: Support Google fonts and font families with multiple fonts
(#1338) via Toni Rico (@tonidero)
* `Paywalls`: Support custom fonts through FontProvider (#1328) via Toni
Rico (@tonidero)
* `Paywalls`: fixed Footer padding (#1354) via NachoSoto (@NachoSoto)
* `Paywalls`: Rename PaywallView to Paywall (#1351) via Toni Rico
(@tonidero)
* `Paywalls`: disable PurchaseButton during purchases (#1352) via
NachoSoto (@NachoSoto)
* `Paywalls`: enable library publishing (#1353) via NachoSoto
(@NachoSoto)
* `Paywalls`: handle "action in progress" state (#1346) via NachoSoto
(@NachoSoto)
* `Paywalls`: support {{ sub_duration_in_months }} (#1348) via NachoSoto
(@NachoSoto)
* `Paywalls`: disallow purchasing currently subscribed products (#1334)
via NachoSoto (@NachoSoto)
* `Paywalls`: new PaywallActivityLauncher.launchIfNeeded methods (#1335)
via NachoSoto (@NachoSoto)
* `Paywalls`: PaywallColor supports RGBA (#1332) via NachoSoto
(@NachoSoto)
* `Paywalls`: Make DialogScaffold private (#1329) via Toni Rico
(@tonidero)
* Add `revenuecatui` `gradle.properties` to specify name of dependency
(#1324) via Toni Rico (@tonidero)
* `Paywalls`: log error when failing to load images (#1321) via
NachoSoto (@NachoSoto)
* Log errors when displaying default paywall (#1318) via Cesar de la
Vega (@vegaro)
* Rename packages to packageIds in `PaywallData` (#1309) via Cesar de la
Vega (@vegaro)
* Add support for multiple intro offers in `IntroEligibilityStateView`
(#1319) via Cesar de la Vega (@vegaro)
* Fix material theme references to use Material3 versions (#1326) via
Toni Rico (@tonidero)
* `Paywalls`: Add support to launch paywall as activity (#1317) via Toni
Rico (@tonidero)
* Parse `{{ sub_offer_price_2 }}` and `{{ sub_offer_duration_2 }}`
variables (#1313) via Cesar de la Vega (@vegaro)
* `Paywalls`: changed PaywallsTester app icon (#1323) via NachoSoto
(@NachoSoto)
* `Paywalls`: fixed PaywallDialog.setRequiredEntitlementIdentifier
(#1322) via NachoSoto (@NachoSoto)
* `Paywalls`: Markdown support (#1312) via NachoSoto (@NachoSoto)
* `PaywallsTester`: added template name to offerings list (#1316) via
NachoSoto (@NachoSoto)
* `Paywalls`: Update paywall tester to be able to display paywall footer
(#1315) via Toni Rico (@tonidero)
* `Paywalls`: Add PaywallFooter composable to present a minified paywall
UI that allows for custom paywalls (#1314) via Toni Rico (@tonidero)
* `Paywalls`: use IntroEligibilityStateView (#1311) via NachoSoto
(@NachoSoto)
* `PaywallData` validation tests (#1310) via Cesar de la Vega (@vegaro)
* `Paywalls`: implemented LoadingPaywallView with placeholder (#1284)
via NachoSoto (@NachoSoto)
* `Paywalls`: created LoadingPaywallView (#1282) via NachoSoto
(@NachoSoto)
* Fix template test data (#1308) via Cesar de la Vega (@vegaro)
</details>

### Other Changes
Add `purchases.setOnesignalUserID` (#1304) via Raquel Diez
(@Raquel10-RevenueCat)

---------

Co-authored-by: revenuecat-ops <ops@revenuecat.com>
Co-authored-by: NachoSoto <ignaciosoto90@gmail.com>