Add `SuperwallOptions.passIdentifierstoPlayStore` option

[ianrumac]

Changes in this pull request

• Adds a new option to SuperwallOptions - passIdentifiersToPlayStore which allows you to pass the user's identifiers (from Superwall.instance.identify(userId: String, ...)) to the Play Store when making a purchase. Note: When passing in identifiers to use with the play store, please make sure to follow their [guidelines](https://developer.android.com/reference/com/android/billingclient/api/BillingFlowParams.Builder#setObfuscatedAccountId(java.lang.String).

Checklist

• [x] All unit tests pass.
• [x] All UI tests pass.
• [x] Demo project builds and runs.
• [x] I added/updated tests or detailed why my change isn't tested.
• [x] I added an entry to the CHANGELOG.md for any breaking changes, enhancements, or bug fixes.
• [x] I have run ktlint in the main directory and fixed any issues.
• [x] I have updated the SDK documentation as well as the online docs.
• [x] I have reviewed the contributing guide