Provides Sign In With Apple functionality to Android apps using firebase_auth
final FirebaseAuth firebaseAuth = FirebaseAuth.instance;
final AndroidFirebaseSiwa androidFirebaseSiwa = AndroidFirebaseSiwa.instance;
await androidFirebaseSiwa.signInWithApple();
final FirebaseUser user = firebaseAuth.currentUser();
Scopes are currently set to "name" and "email", more info here