GoogleDriveDownloadRequest, which resolves file id and then downloads it
with GoogleDriveStorage::downloadById().
GoogleDriveStreamFileRequest, which resolves file id and then returns
file stream with GoogleDriveStorage::streamFileById().
This commit also adds GoogleDriveStorage::streamFileById() itself.
A minor GoogleDriveResolveIdRequest fix added.
With these one can download files from Google Drive.
