initializeService method
Initializes the InqvineAuthService and starts listening to Firebase for user state changes. Will set performedInitialAuthCheck when the first user check returns
Implementation
Future<void> initializeService() async {
'Checking is a user is already logged in'.logInfo();
_userSubscription = inqvineFirebase.firebaseAuth.authStateChanges().listen(_onAuthStateChanged);
await super.initializeService();
}