Add domain layer for get list Email in Mailbox

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

@@ -0,0 +1,20 @@
+import 'package:core/core.dart';
+import 'package:model/model.dart';
+
+class GetAllEmailSuccess extends UIState {
+  final List<PresentationEmail> emailList;
+
+  GetAllEmailSuccess(this.emailList);
+
+  @override
+  List<Object> get props => [emailList];
+}
+
+class GetAllEmailFailure extends FeatureFailure {
+  final exception;
+
+  GetAllEmailFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}