files from HuggingFace cannot be cached

[skshetry]

Description

  File "/home/runner/work/datachain/datachain/.nox/examples-3-12/lib/python3.12/site-packages/datachain/lib/prefetcher.py", line 31, in _prefetch_input
    await obj._prefetch()
  File "/home/runner/work/datachain/datachain/.nox/examples-3-12/lib/python3.12/site-packages/datachain/lib/file.py", line 275, in _prefetch
    await client._download(self, callback=self._download_cb)
  File "/home/runner/work/datachain/datachain/.nox/examples-3-12/lib/python3.12/site-packages/datachain/client/fsspec.py", line 374, in _download
    await self._put_in_cache(file, callback=callback)
  File "/home/runner/work/datachain/datachain/.nox/examples-3-12/lib/python3.12/site-packages/datachain/client/fsspec.py", line 382, in _put_in_cache
    etag = await self.get_current_etag(file)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/datachain/datachain/.nox/examples-3-12/lib/python3.12/site-packages/datachain/client/fsspec.py", line 204, in get_current_etag
    info = await self.fs._info(self.get_full_path(file.path))
                 ^^^^^^^^^^^^^
AttributeError: 'HfFileSystem' object has no attribute '_info'. Did you mean: 'info'?

HfClient does not implement all the APIs necessary for caching. That also breaks prefetching.
HFFileSystem only offers sync interface, so it is very much incompatible with the expectation of Client which expects an AsyncFileSystem. So it's fundamentally broken.

[skshetry]

I'll disable prefetching for hf for now.