[Domain] Added a model to backup game codes

lib/domain/enums/app_backup_data_type.dart

@@ -4,5 +4,6 @@ enum AppBackupDataType {
   calculatorAscMaterials,
   tierList,
   customBuilds,
+  gameCodes,
   notifications,
 }

lib/domain/models/backup/backup_game_code_model.dart

@@ -0,0 +1,29 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'backup_game_code_model.freezed.dart';
+part 'backup_game_code_model.g.dart';
+
+@freezed
+class BackupGameCodeModel with _$BackupGameCodeModel {
+  const factory BackupGameCodeModel({
+    required String code,
+    DateTime? usedOn,
+    DateTime? discoveredOn,
+    DateTime? expiredOn,
+    required bool isExpired,
+    int? region,
+    @Default(<BackupGameCodeRewardModel>[]) List<BackupGameCodeRewardModel> rewards,
+  }) = _BackupGameCodeModel;
+
+  factory BackupGameCodeModel.fromJson(Map<String, dynamic> json) => _$BackupGameCodeModelFromJson(json);
+}
+
+@freezed
+class BackupGameCodeRewardModel with _$BackupGameCodeRewardModel {
+  const factory BackupGameCodeRewardModel({
+    required String itemKey,
+    required int quantity,
+  }) = _BackupGameCodeRewardModel;
+
+  factory BackupGameCodeRewardModel.fromJson(Map<String, dynamic> json) => _$BackupGameCodeRewardModelFromJson(json);
+}

lib/domain/models/backup/backup_model.dart

@@ -19,6 +19,7 @@ class BackupModel with _$BackupModel {
     List<BackupCalculatorAscMaterialsSessionModel>? calculatorAscMaterials,
     List<BackupCustomBuildModel>? customBuilds,
     List<BackupTierListModel>? tierList,
+    List<BackupGameCodeModel>? gameCodes,
     BackupNotificationsModel? notifications,
   }) = _BackupModel;
 

lib/domain/models/models.dart

@@ -2,6 +2,7 @@ export 'artifacts/artifact_card_model.dart';
 export 'backup/backup_app_settings_model.dart';
 export 'backup/backup_calculator_asc_materials_model.dart';
 export 'backup/backup_custom_builds_model.dart';
+export 'backup/backup_game_code_model.dart';
 export 'backup/backup_inventory_model.dart';
 export 'backup/backup_model.dart';
 export 'backup/backup_notifications_model.dart';