add either and state in interactor

lib/features/mailbox_dashboard/domain/state/get_composer_cache_state.dart

@@ -0,0 +1,21 @@
+import 'package:core/core.dart';
+import 'package:tmail_ui_user/features/mailbox_dashboard/data/model/composer_cache.dart';
+
+class GetComposerCacheSuccess extends UIState {
+
+  final ComposerCache composerCache;
+
+  GetComposerCacheSuccess(this.composerCache);
+
+  @override
+  List<Object> get props => [composerCache];
+}
+
+class GetComposerCacheFailure extends FeatureFailure {
+  final dynamic exception;
+
+  GetComposerCacheFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

lib/features/mailbox_dashboard/domain/state/remove_composer_cache_state.dart

@@ -0,0 +1,18 @@
+import 'package:core/core.dart';
+
+class RemoveComposerCacheSuccess extends UIState {
+
+  RemoveComposerCacheSuccess();
+
+  @override
+  List<Object?> get props => [];
+}
+
+class RemoveComposerCacheFailure extends FeatureFailure {
+  final dynamic exception;
+
+  RemoveComposerCacheFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

lib/features/mailbox_dashboard/domain/state/save_composer_cache_state.dart

@@ -0,0 +1,18 @@
+import 'package:core/core.dart';
+
+class SaveComposerCacheSuccess extends UIState {
+
+  SaveComposerCacheSuccess();
+
+  @override
+  List<Object> get props => [];
+}
+
+class SaveComposerCacheFailure extends FeatureFailure {
+  final dynamic exception;
+
+  SaveComposerCacheFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}