[Refactor] Refactor fileio

[Tau-J]

Motivation

Modification

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.10 🎉

Comparison is base (3af7fed) 81.46% compared to head (07dc00f) 81.56%.

❗ Current head 07dc00f differs from pull request most recent head 5dd39f6. Consider uploading reports for the commit 5dd39f6 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2087      +/-   ##
===========================================
+ Coverage    81.46%   81.56%   +0.10%     
===========================================
  Files          227      227              
  Lines        13513    13509       -4     
  Branches      2306     2304       -2     
===========================================
+ Hits         11008    11019      +11     
+ Misses        1987     1972      -15     
  Partials       518      518              

Flag	Coverage Δ
unittests	81.56% <100.00%> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
mmpose/datasets/transforms/loading.py	100.00% <ø> (ø)
mmpose/engine/hooks/visualization_hook.py	89.65% <100.00%> (+2.55%)	⬆️

... and 2 files with indirect coverage changes

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