TF-2821 calendar event maybe create interactor

lib/features/email/domain/state/calendar_event_maybe_state.dart

@@ -0,0 +1,15 @@
+import 'package:jmap_dart_client/jmap/mail/calendar/reply/calendar_event_maybe_response.dart';
+import 'package:tmail_ui_user/features/email/domain/state/calendar_event_reply_state.dart';
+
+class CalendarEventMaybeReplying extends CalendarEventReplying {}
+
+class CalendarEventMaybeSuccess extends CalendarEventReplySuccess {
+  final CalendarEventMaybeResponse calendarEventMaybeResponse;
+  
+  CalendarEventMaybeSuccess(this.calendarEventMaybeResponse)
+    : super(calendarEventMaybeResponse);
+}
+
+class CalendarEventMaybeFailure extends CalendarEventReplyFailure {
+  CalendarEventMaybeFailure({super.exception});
+}

lib/features/email/domain/usecases/maybe_calendar_event_interactor.dart

@@ -0,0 +1,26 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:tmail_ui_user/features/email/domain/repository/calendar_event_repository.dart';
+import 'package:tmail_ui_user/features/email/domain/state/calendar_event_maybe_state.dart';
+
+class MaybeCalendarEventInteractor {
+  MaybeCalendarEventInteractor(this._calendarEventRepository);
+
+  final CalendarEventRepository _calendarEventRepository;
+
+  Stream<Either<Failure, Success>> execute(
+    AccountId accountId,
+    Set<Id> blobIds
+  ) async* {
+    try {
+      yield Right(CalendarEventMaybeReplying());
+      final result = await _calendarEventRepository.maybeEventInvitation(accountId, blobIds);
+      yield Right(CalendarEventMaybeSuccess(result));
+    } catch (e) {
+      yield Left(CalendarEventMaybeFailure(exception: e));
+    }
+  }
+}