[Demo] Support Skeleton demo

[Dai-Wenxun]

Modification

Support Skeleton demo.

[codecov]

Codecov Report

Base: 74.70% // Head: 74.23% // Decreases project coverage by -0.47% ⚠️

Coverage data is based on head (881ce57) compared to base (a15b934).
Patch coverage: 33.68% of modified lines in pull request are covered.

❗ Current head 881ce57 differs from pull request most recent head 09d2e5f. Consider uploading reports for the commit 09d2e5f to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1920      +/-   ##
===========================================
- Coverage    74.70%   74.23%   -0.48%     
===========================================
  Files          133      133              
  Lines         9260     9327      +67     
  Branches      1584     1590       +6     
===========================================
+ Hits          6918     6924       +6     
- Misses        2023     2080      +57     
- Partials       319      323       +4     

Flag	Coverage Δ
unittests	74.23% <33.68%> (-0.48%)	⬇️

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

Impacted Files	Coverage Δ
mmaction/utils/misc.py	32.43% <22.22%> (-27.57%)	⬇️
mmaction/apis/inference.py	43.75% <30.00%> (-43.75%)	⬇️
mmaction/apis/__init__.py	100.00% <100.00%> (ø)
mmaction/datasets/transforms/formatting.py	83.41% <100.00%> (ø)
mmaction/datasets/transforms/loading.py	84.28% <100.00%> (ø)
mmaction/utils/__init__.py	100.00% <100.00%> (ø)

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