feat: Allow showing regular notifications

packages/moxplatform_android/lib/src/notifications_android.dart

@@ -24,6 +24,11 @@ class AndroidNotificationsImplementation extends NotificationsImplementation {
     return _api.showMessagingNotification(notification);
   }
 
+  @override
+  Future<void> showNotification(RegularNotification notification) async {
+    return _api.showNotification(notification);
+  }
+
   @override
   Future<void> setNotificationSelfAvatar(String path) async {
     return _api.setNotificationSelfAvatar(path);