TF-439 Add abstract method to register new token

lib/features/push_notification/domain/model/register_new_token_request.dart

@@ -0,0 +1,18 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:fcm/model/firebase_subscription.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+
+class RegisterNewTokenRequest with EquatableMixin {
+
+  final Id createRequestId;
+  final FirebaseSubscription firebaseSubscription;
+
+  RegisterNewTokenRequest(this.createRequestId, this.firebaseSubscription);
+
+  @override
+  List<Object?> get props => [
+    createRequestId,
+    firebaseSubscription
+  ];
+}