TF-1289: [Data] Implement DestroySubscription in fcm datasource

lib/features/push_notification/data/datasource_impl/cache_fcm_datasource_impl.dart

@@ -68,4 +68,9 @@ class CacheFCMDatasourceImpl extends FCMDatasource {
       _exceptionThrower.throwException(error);
     });
   }
+
+  @override
+  Future<bool> destroySubscription(String subscriptionId) {
+    throw UnimplementedError();
+  }
 }

lib/features/push_notification/data/datasource_impl/fcm_datasource_impl.dart

@@ -58,4 +58,13 @@ class FcmDatasourceImpl extends FCMDatasource {
   Future<FCMSubscriptionCache> geSubscription() {
     throw UnimplementedError();
   }
+
+  @override
+  Future<bool> destroySubscription(String subscriptionId) {
+    return Future.sync(() async {
+      return await _fcmApi.destroySubscription(subscriptionId);
+    }).catchError((error) {
+      _exceptionThrower.throwException(error);
+    });
+  }
 }