TF-536 Add domain layer for edit identity

lib/features/manage_account/domain/model/edit_identity_request.dart

@@ -0,0 +1,14 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/identities/identity.dart';
+
+class EditIdentityRequest with EquatableMixin {
+
+  final Identity newIdentity;
+  final IdentityId identityId;
+
+  EditIdentityRequest(this.identityId, this.newIdentity);
+
+  @override
+  List<Object?> get props => [identityId, newIdentity];
+}