Create an async read request for a range of bulk data streaming tokens The request will read all data between the two given streaming tokens objects. They must both represent areas of data in the file! There is no way to validate this and it is up to the caller to make sure that it is correct. The memory to be read into will be automatically allocated the size of which can be retrieved by callingIBulkDataIORequest::GetSize()A request for the read. This is owned by the caller and must be deleted by the caller.