TF-1289: [Domain] Add DestroySubscription in use-case

lib/features/push_notification/domain/repository/fcm_repository.dart

@@ -30,4 +30,6 @@ abstract class FCMRepository {
   Future<FirebaseSubscription> registerNewToken(RegisterNewTokenRequest newTokenRequest);
 
   Future<FCMSubscription> getSubscription();
+
+  Future<bool> destroySubscription(String subscriptionId);
 }

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

@@ -0,0 +1,24 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+
+class DestroySubscriptionLoading extends UIState {}
+
+class DestroySubscriptionSuccess extends UIState {
+
+  final bool destroyedSubscription;
+
+  DestroySubscriptionSuccess(this.destroyedSubscription);
+
+  @override
+  List<Object> get props => [destroyedSubscription];
+}
+
+class DestroySubscriptionFailure extends FeatureFailure {
+  final dynamic exception;
+
+  DestroySubscriptionFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

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

@@ -0,0 +1,22 @@
+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/repository/fcm_repository.dart';
+import 'package:tmail_ui_user/features/push_notification/domain/state/destroy_subscription_state.dart';
+
+class DestroySubscriptionInteractor {
+
+  final FCMRepository _fcmRepository;
+
+  DestroySubscriptionInteractor(this._fcmRepository);
+
+  Stream<Either<Failure, Success>> execute(String subscriptionId) async* {
+    try {
+      yield Right<Failure, Success>(DestroySubscriptionLoading());
+      final destroyedSubscription = await _fcmRepository.destroySubscription(subscriptionId);
+      yield Right<Failure, Success>(DestroySubscriptionSuccess(destroyedSubscription));
+    } catch (e) {
+      yield Left<Failure, Success>(DestroySubscriptionFailure(e));
+    }
+  }
+}