TF-524 Store recent search in hive database.

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

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