[Feature] Add models trained on Body8

[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: 80.00% and project coverage change: -0.01 ⚠️

Comparison is base (e10c661) 82.01% compared to head (feeac0c) 82.00%.

❗ Current head feeac0c differs from pull request most recent head cad734c. Consider uploading reports for the commit cad734c to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2331      +/-   ##
===========================================
- Coverage    82.01%   82.00%   -0.01%     
===========================================
  Files          232      232              
  Lines        13643    13638       -5     
  Branches      2319     2319              
===========================================
- Hits         11189    11184       -5     
  Misses        1918     1918              
  Partials       536      536              

Flag	Coverage Δ
unittests	82.00% <80.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
mmpose/models/losses/classification_loss.py	80.23% <80.00%> (-1.09%)	⬇️

... and 1 file with indirect coverage changes

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