* feat: add conf_path in PetrelBackend

* Update mmengine/fileio/backends/petrel_backend.py

Co-authored-by: Mashiro <57566630+HAOCHENYE@users.noreply.github.com>

Co-authored-by: Zaida Zhou <58739961+zhouzaida@users.noreply.github.com>
Co-authored-by: Mashiro <57566630+HAOCHENYE@users.noreply.github.com>

* [Refactor] Refactor fileio but without breaking bc

* handle compatibility

* fix format

* modify io functions

* fix ut

* fix ut

* rename method names

* refine

* refine docstring

* fix ut in windows

* update ut

* minor fix

* ensure client is not None when closing it

* add more examples for list_dir_or_file interface

* refine docstring

* refine deprecated info

* fix ut

* add a description for lmdb docstring

* [Refactor] Refactor the import rule

* minor refinement

* add a comment

[Refactor]: migrate LMDB backends and modifications from open-mmlab/mmcv#1764 and  open-mmlab/mmcv#1747 (#426)

* Add fileio ut

* pick modification from master branch

* pick modification from mmcv #1764

* test fileio without mmcv

* remove unnecessary checking

* Add pyupgrade pre-commit hook

* fix ut

* remove comments

* move fileio directory from utils

* remove CephBackend from fileio and clear some deprecated docstring

* fix format

* fix a spellling error