re-add download_manager module in utils

Author: lhoestq

src/datasets/__init__.py

@@ -69,4 +69,12 @@
 )
 from .tasks import *
 from .utils import *
+from .utils import download_manager as _deprecated_download_manager
 from .utils import logging
+
+
+# deprecated modules
+
+
+_deprecated_download_manager.DownloadMode = DownloadMode
+_deprecated_download_manager.DownloadManager = DownloadManager

src/datasets/utils/download_manager.py

@@ -0,0 +1,4 @@
+# deprecated, please use daatsets.download.download_manager
+
+DownloadMode = None
+DownloadManager = None