TF-1289: [Domain] add storeSubscription use-case

lib/features/push_notification/domain/state/store_subscription_state.dart

@@ -0,0 +1,22 @@
+
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+class StoreSubscriptionLoading extends UIState {}
+
+class StoreSubscriptionSuccess extends UIState {
+
+  StoreSubscriptionSuccess();
+
+  @override
+  List<Object> get props => [];
+}
+
+class StoreSubscriptionFailure extends FeatureFailure {
+  final dynamic exception;
+
+  StoreSubscriptionFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

lib/features/push_notification/domain/usecases/store_subscription_interator.dart

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+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+import 'package:dartz/dartz.dart';
+import 'package:tmail_ui_user/features/push_notification/domain/model/fcm_subscription.dart';
+import 'package:tmail_ui_user/features/push_notification/domain/repository/fcm_repository.dart';
+import 'package:tmail_ui_user/features/push_notification/domain/state/store_subscription_state.dart';
+
+class StoreSubscriptionInteractor {
+  final FCMRepository _fcmRepository;
+
+  StoreSubscriptionInteractor(this._fcmRepository);
+
+  Stream<Either<Failure, Success>> execute(FCMSubscription fcmSubscription) async* {
+    try {
+      yield Right<Failure, Success>(StoreSubscriptionLoading());
+      await _fcmRepository.storeSubscription(fcmSubscription);
+      yield Right<Failure, Success>(StoreSubscriptionSuccess());
+    } catch (e) {
+      yield Left<Failure, Success>(StoreSubscriptionFailure(e));
+    }
+  }
+}