TF-657 Add interactor/repository/datasource for SendReceiptToSender

lib/features/email/domain/model/send_receipt_to_sender_request.dart

@@ -0,0 +1,21 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/identities/identity.dart';
+import 'package:jmap_dart_client/jmap/mdn/mdn.dart';
+
+class SendReceiptToSenderRequest with EquatableMixin {
+
+  final MDN mdn;
+  final IdentityId identityId;
+  final Id sendId;
+
+  SendReceiptToSenderRequest({
+    required this.mdn,
+    required this.identityId,
+    required this.sendId
+  });
+
+  @override
+  List<Object?> get props => [mdn, identityId, sendId];
+}