…chases.syncAttributesAndOfferingsIfNeeded()` (#925)

## Motivation

Bump to PHC `10.1.0` and add support for new Targeting methods

## Description

### Get Current Offering for Placement

Get an offering specific to the place of your paywall (eg: onboarding,
settings, feature gate, etc). This is determined by Targeting.

```ts
let offering = await Purchases.getCurrentOfferingForPlacement("your-placement-identifier")
if (offering) {
    // Navigate to paywall
} else {
    // Do nothing or continue to another screen
}
```

### Sync Attributes and Offerings

A blocking call to sync attributes and fetch new offerings to to be used
with Targeting that uses Custom Attributes.

```ts
// Using this result is optional - offerings will be cached for next Purchases.getOfferings() call
let offerings = await Purchases.syncAttributesAndOfferingsIfNeeded()
```