TF-4195 Add Label to Thread

lib/features/email/domain/state/add_a_label_to_an_thread_state.dart

@@ -0,0 +1,29 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
+
+class AddingALabelToAThread extends LoadingState {}
+
+class AddALabelToAThreadSuccess extends UIState {
+  final List<EmailId> emailIds;
+  final KeyWordIdentifier labelKeyword;
+  final String labelDisplay;
+
+  AddALabelToAThreadSuccess(this.emailIds, this.labelKeyword, this.labelDisplay);
+
+  @override
+  List<Object> get props => [emailIds, labelKeyword, labelDisplay];
+}
+
+class AddALabelToAThreadFailure extends FeatureFailure {
+  final String labelDisplay;
+
+  AddALabelToAThreadFailure({
+    dynamic exception,
+    required this.labelDisplay,
+  }) : super(exception: exception);
+
+  @override
+  List<Object?> get props => [...super.props, labelDisplay];
+}