[HfFileSystem] add expand_info arg (#3575)
* hffs: expand_info arg
* style
* Update src/huggingface_hub/hf_file_system.py
Co-authored-by: célina <hanouticelina@gmail.com>
* up-to-date HfFileSystem docstring
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Co-authored-by: célina <hanouticelina@gmail.com>
