signInWithAppleOnWeb method
Implementation
Future<User> signInWithAppleOnWeb() async {
final provider = OAuthProvider('apple.com')
..addScope('email')
..addScope('name');
await FirebaseAuth.instance.signInWithPopup(provider);
if (_firebaseAuth.currentUser != null) return _firebaseAuth.currentUser!;
throw Exception('_firebaseAuth.currentUser is null');
}