TF-437 Handle Mailbox/changes in background/terminated

lib/features/push_notification/domain/state/get_mailbox_state_to_refresh_state.dart

@@ -0,0 +1,25 @@
+
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:jmap_dart_client/jmap/core/state.dart' as jmap;
+
+class GetMailboxStateToRefreshLoading extends UIState {}
+
+class GetMailboxStateToRefreshSuccess extends UIState {
+
+  final jmap.State storedState;
+
+  GetMailboxStateToRefreshSuccess(this.storedState);
+
+  @override
+  List<Object> get props => [storedState];
+}
+
+class GetMailboxStateToRefreshFailure extends FeatureFailure {
+  final dynamic exception;
+
+  GetMailboxStateToRefreshFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}