TF-1667 Implement GetSpamMailboxCached interactor

(cherry picked from commit ffe62c58aa46526ea34536bac17862b5c16aa9ac)

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

@@ -0,0 +1,23 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
+
+class GetSpamMailboxCachedLoading extends UIState {}
+
+class GetSpamMailboxCachedSuccess extends UIState {
+
+  final Mailbox spamMailbox;
+
+  GetSpamMailboxCachedSuccess(this.spamMailbox);
+
+  @override
+  List<Object> get props => [spamMailbox];
+}
+
+class GetSpamMailboxCachedFailure extends FeatureFailure {
+
+  GetSpamMailboxCachedFailure(exception) : super(exception: exception);
+
+  @override
+  List<Object?> get props => [exception];
+}