[React Native] Feature Flags Reporting - Firebase Remote Config integration

### Description

This is to add an integration into the SDK to automatically detect and report updates to feature flag configurations (evaluation tracking) performed in the app via Firebase Remote Config: [https://pub.dev/packages/firebase_remote_config]()

Dev docs on feature flags integrations: [https://develop.sentry.dev/sdk/expected-features/#integrations]()
Existing integrations (product): [https://docs.sentry.io/organization/integrations/feature-flag/]()
Existing integrations with evaluation tracking (JS): [https://docs.sentry.io/platforms/javascript/feature-flags/#enable-evaluation-tracking]()

Relates to:

* [https://github.com/getsentry/sentry/issues/86039]()