Implement streaming data into Flutter

packages/moxplatform_android/lib/src/notifications_android.dart

@@ -1,17 +1,32 @@
+import 'dart:async';
+import 'package:flutter/services.dart';
 import 'package:moxplatform_platform_interface/moxplatform_platform_interface.dart';
 
 class AndroidNotificationsImplementation extends NotificationsImplementation {
   final MoxplatformApi _api = MoxplatformApi();
 
+  final EventChannel _channel =
+      const EventChannel('me.polynom/notification_stream');
 
   @override
-  Future<void> createNotificationChannel(String title, String id, bool urgent) async {
+  Future<void> createNotificationChannel(
+    String title,
+    String id,
+    bool urgent,
+  ) async {
     return _api.createNotificationChannel(title, id, urgent);
   }
 
-
   @override
-  Future<void> showMessagingNotification(MessagingNotification notification) async {
+  Future<void> showMessagingNotification(
+    MessagingNotification notification,
+  ) async {
     return _api.showMessagingNotification(notification);
   }
+
+  @override
+  Stream<NotificationEvent> getEventStream() => _channel
+      .receiveBroadcastStream()
+      .cast<Object>()
+      .map(NotificationEvent.decode);
 }