TF-4141 Add Action required folder to left menu

lib/features/thread/domain/state/get_count_emails_in_folder_state.dart

@@ -0,0 +1,18 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+class GettingCountUnreadEmailsInFolder extends LoadingState {}
+
+class GetCountUnreadEmailsInFolderSuccess extends UIState {
+  final int count;
+
+  GetCountUnreadEmailsInFolderSuccess({required this.count});
+
+  @override
+  List<Object> get props => [count];
+}
+
+class GetCountUnreadEmailsInFolderFailure extends FeatureFailure {
+  GetCountUnreadEmailsInFolderFailure(dynamic exception)
+      : super(exception: exception);
+}