allow the s3 list api to accept an optional bucket

Author: ekjotmultani

packages/amplify_core/lib/src/types/storage/list_options.dart

@@ -27,6 +27,9 @@ class StorageListOptions
 
   /// {@macro amplify_core.storage.list_plugin_options}
   final StorageListPluginOptions? pluginOptions;
+  
+  /// an optional bucket to specify which bucket to return the list for
+  final StorageBucket? bucket;
 
   /// an optional bucket to specify which bucket to return the list for
   final StorageBucket? bucket;

packages/storage/amplify_storage_s3_dart/lib/src/amplify_storage_s3_dart_impl.dart

@@ -124,7 +124,7 @@ class AmplifyStorageS3Dart extends StoragePluginInterface
     });
   }
 
-  @override
+   @override
   S3ListOperation list({
     required StoragePath path,
     StorageListOptions? options,
@@ -152,6 +152,7 @@ class AmplifyStorageS3Dart extends StoragePluginInterface
     );
   }
 
+
   @override
   S3GetPropertiesOperation getProperties({
     required StoragePath path,