[Refactor] Support CID

[Ben-Louis]

Motivation

Modification

1. add CIDHead
2. add a codec for CID named 'DecoupledHeatmap', which means that the heatmaps for each instance are decoupled and represented on different channels
3. add configs

TODO:

• [x] add unittests
• [x] add docstrings

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[bot]]

Codecov Report

Base: 80.17% // Head: 82.08% // Increases project coverage by +1.90% :tada:

Coverage data is based on head (96b5f8c) compared to base (d83c4ba). Patch coverage: 87.24% of modified lines in pull request are covered.

:exclamation: Current head 96b5f8c differs from pull request most recent head 70acbbe. Consider uploading reports for the commit 70acbbe to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1907      +/-   ##
===========================================
+ Coverage    80.17%   82.08%   +1.90%     
===========================================
  Files          210      213       +3     
  Lines        12522    12650     +128     
  Branches      2112     2130      +18     
===========================================
+ Hits         10040    10384     +344     
+ Misses        2028     1803     -225     
- Partials       454      463       +9     

Flag	Coverage Δ
unittests	82.08% <87.24%> (+1.90%)	:arrow_up:

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

Impacted Files	Coverage Δ
mmpose/visualization/local_visualizer.py	79.54% <55.55%> (-1.30%)	:arrow_down:
mmpose/datasets/transforms/bottomup_transforms.py	79.77% <75.00%> (-0.11%)	:arrow_down:
mmpose/models/heads/heatmap_heads/cid_head.py	80.45% <80.45%> (ø)
mmpose/models/utils/transformer.py	82.40% <87.50%> (+8.28%)	:arrow_up:
mmpose/codecs/decoupled_heatmap.py	88.42% <88.42%> (ø)
mmpose/codecs/utils/instance_property.py	89.18% <89.18%> (ø)
mmpose/codecs/utils/gaussian_heatmap.py	86.02% <90.00%> (+0.46%)	:arrow_up:
mmpose/visualization/simcc_vis.py	98.59% <98.59%> (ø)
mmpose/__init__.py	100.00% <100.00%> (ø)
mmpose/apis/inference.py	76.23% <100.00%> (+0.72%)	:arrow_up:
... and 23 more

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