initialize method
Initializes the provider with configuration settings
Implementation
@override
Future<void> initialize(Map<String, dynamic> config) async {
if (_isInitialized) return;
_auth = FirebaseApp.instance.getAuth();
_tokenManager = DSTokenManager();
_sessionManager = DSSessionManager();
_eventHandler = DSFirebaseEventHandler(onEvent: _handleAuthEvent);
_eventHandler.initialize(_auth);
_isInitialized = true;
}