## Summary
- Expose `trackCustomPaywallImpression` as a public API in Capacitor
- Support optional `paywallId` and `offeringId` parameters via
`TrackCustomPaywallImpressionOptions`
- If `offeringId` is not provided, the SDK uses the current offering
identifier from the cache
- Add prompt-based UI in purchase tester for testing with custom paywall
and offering IDs

## Changes
- **TypeScript:** `TrackCustomPaywallImpressionOptions` with `paywallId`
and `offeringId` in `definitions.ts`
- **iOS bridge:** `trackCustomPaywallImpression` in
`PurchasesPlugin.swift`
- **Android bridge:** `trackCustomPaywallImpression` in
`PurchasesPlugin.kt`
- **Web:** Mock implementation in `web.ts`
- **Purchase tester:** Prompt-based UI for entering paywall ID and
offering ID

### Related PRs
- purchases-hybrid-common:
RevenueCat/purchases-hybrid-common#1565
- react-native-purchases:
RevenueCat/react-native-purchases#1679
- purchases-unity:
RevenueCat/purchases-unity#869

## Summary
- Expose `trackCustomPaywallImpression` as a public API in Flutter
- Support optional `paywallId` and `offeringId` parameters via
`CustomPaywallImpressionParams`
- If `offeringId` is not provided, the SDK uses the current offering
identifier from the cache
- Pass full arguments dictionary to PHC on both iOS and Android instead
of unpacking individual fields
- Add purchase tester screen with text fields for paywall ID and
offering ID

## Changes
- **Dart:** `CustomPaywallImpressionParams` with `paywallId` and
`offeringId`
- **iOS bridge:** Pass arguments dictionary directly to
`[RCCommonFunctionality trackCustomPaywallImpression:]`
- **Android bridge:** Pass arguments map directly to
`CommonKt.trackCustomPaywallImpression()`
- **Tests:** Unit tests for all parameter combinations
- **API tester:** Compile-time verification of all API shapes
- **Purchase tester:** Screen with text fields for paywall ID and
offering ID

### Related PRs
- purchases-hybrid-common:
RevenueCat/purchases-hybrid-common#1565
- react-native-purchases:
RevenueCat/react-native-purchases#1679
- purchases-unity:
RevenueCat/purchases-unity#869
- purchases-capacitor:
RevenueCat/purchases-capacitor#725

**This is an automatic release.**

## RevenueCat SDK
### ✨ New Features
* Add offeringId override to trackCustomPaywallImpression (#869) via
Rick (@rickvdl)
### 📦 Dependency Updates
* [AUTOMATIC BUMP] Updates purchases-hybrid-common to 17.52.0 (#870) via
RevenueCat Git Bot (@RCGitBot)

## RevenueCatUI SDK
### ✨ New Features
* Add number and boolean custom variable types (#865) via Facundo
Menzella (@facumenzella)

### 🔄 Other Changes
* Bump fastlane-plugin-revenuecat_internal from `3e8c384` to `9a6911b`
(#868) via dependabot[bot] (@dependabot[bot])