Init login feature add data layer

lib/features/login/data/model/converter/user_id_converter.dart

@@ -0,0 +1,14 @@
+import 'dart:convert';
+
+import 'package:json_annotation/json_annotation.dart';
+import 'package:model/model.dart';
+
+class UserIdConverter implements JsonConverter<UserId, String> {
+  const UserIdConverter();
+
+  @override
+  UserId fromJson(String json) => UserId(json);
+
+  @override
+  String toJson(UserId object) => jsonEncode(object.id);
+}