addRequestToRequestController<TData, TVars>  method 
adds a request to the requestController of the client on the isolate this is useful for re-fetch and pagination see https://ferry.gql-dart.dev/docs/pagination
Implementation
Future<void> addRequestToRequestController<TData, TVars>(
    OperationRequest<TData, TVars> request) {
  _debugAssertUpdateResultTransferrable(request);
  return _handleSingleResponseCommand(
      (sendPort) => AddRequestToRequestControllerCommand(sendPort, request));
}