[Refactor] Remove file_client_args and apply new interface of fileio

[fangyixiao18]

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Motivation

Use the new interface of fileio from MMEngine which requires mmengine>=0.2.0.
Refer to open-mmlab/mmcv#2468, open-mmlab/mmcv#2539

mmcv<2.0.0rc4: need to set the file_client_args to indicate the backend, if the file_client_args is None, the default option will be disk backend.
mmcv>=2.0.0rc4 : The function in fileio from MMEngine will automatically deal with different backends according to the prefix of data_root, if parameter backend_args is None

Modification

Update related configs, docs and ut

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch coverage: 80.17% and project coverage change: -1.26 ⚠️

Comparison is base (a1f1dad) 81.84% compared to head (2f8a4e9) 80.59%.

❗ Current head 2f8a4e9 differs from pull request most recent head 90f2d36. Consider uploading reports for the commit 90f2d36 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x     #662      +/-   ##
===========================================
- Coverage    81.84%   80.59%   -1.26%     
===========================================
  Files          120      141      +21     
  Lines         4176     5127     +951     
  Branches       586      687     +101     
===========================================
+ Hits          3418     4132     +714     
- Misses         645      855     +210     
- Partials       113      140      +27     

Flag	Coverage Δ
unittests	80.59% <80.17%> (-1.26%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmselfsup/datasets/transforms/__init__.py	100.00% <ø> (ø)
mmselfsup/datasets/transforms/wrappers.py	100.00% <ø> (ø)
mmselfsup/engine/hooks/deepcluster_hook.py	38.88% <0.00%> (-0.55%)	⬇️
mmselfsup/engine/optimizers/lars.py	16.12% <ø> (ø)
mmselfsup/models/algorithms/odc.py	31.70% <ø> (ø)
mmselfsup/models/backbones/mae_vit.py	100.00% <ø> (ø)
mmselfsup/models/backbones/simmim_swin.py	86.95% <ø> (ø)
mmselfsup/models/heads/latent_heads.py	100.00% <ø> (ø)
mmselfsup/models/losses/swav_loss.py	83.01% <ø> (ø)
mmselfsup/models/backbones/mixmim_backbone.py	23.07% <23.07%> (ø)
... and 41 more

... and 22 files with indirect coverage changes

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[tonysy]

As inline comments

[tonysy]

LGTM