Faster `HfFileSystem.find` (#1809)
* Remove `HfFileSystem.exists` override
* Add `list_repo_tree` to the API
* Rename `BlobLastCommitInfo` to `LastCommitInfo`
* Add `get_paths_info` to the API
* Improve HfFileSystem tests
* Faster `HfFileSystem.find`
* Tests
* Update src/huggingface_hub/hf_api.py
Co-authored-by: Lucain <lucainp@gmail.com>
* Address the rest of comments
* Fix comment
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Co-authored-by: Lucain <lucainp@gmail.com>
