TF-1813 Implement GetAllSendingEmails for domain and data layer

(cherry picked from commit 35fb38a1ed860cfa65ee57ec6d1e5e715fb1b7a7)

lib/features/sending_queue/domain/state/get_all_sending_email_state.dart

@@ -0,0 +1,24 @@
+
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:tmail_ui_user/features/composer/domain/model/sending_email.dart';
+
+class GetAllSendingEmailLoading extends UIState {}
+
+class GetAllSendingEmailSuccess extends UIState {
+
+  final List<SendingEmail> sendingEmails;
+
+  GetAllSendingEmailSuccess(this.sendingEmails);
+
+  @override
+  List<Object?> get props => [sendingEmails];
+}
+
+class GetAllSendingEmailFailure extends FeatureFailure {
+
+  GetAllSendingEmailFailure(dynamic exception) : super(exception: exception);
+
+  @override
+  List<Object?> get props => [exception];
+}