feat: asset metadata (#20446)

mobile/openapi/lib/api_helper.dart

@@ -67,6 +67,9 @@ String parameterToString(dynamic value) {
   if (value is AssetMediaStatus) {
     return AssetMediaStatusTypeTransformer().encode(value).toString();
   }
+  if (value is AssetMetadataKey) {
+    return AssetMetadataKeyTypeTransformer().encode(value).toString();
+  }
   if (value is AssetOrder) {
     return AssetOrderTypeTransformer().encode(value).toString();
   }