[Enhance] Support displaying alias in Inferencer demo and refine docs

[Ben-Louis]

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: 48.64% and project coverage change: +0.02 🎉

Comparison is base (934ca41) 82.28% compared to head (0071c23) 82.31%.

❗ Current head 0071c23 differs from pull request most recent head 22f7437. Consider uploading reports for the commit 22f7437 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2137      +/-   ##
===========================================
+ Coverage    82.28%   82.31%   +0.02%     
===========================================
  Files          227      228       +1     
  Lines        13370    13387      +17     
  Branches      2266     2268       +2     
===========================================
+ Hits         11002    11020      +18     
- Misses        1849     1851       +2     
+ Partials       519      516       -3     

Flag	Coverage Δ
unittests	82.31% <48.64%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
mmpose/models/heads/heatmap_heads/ae_head.py	82.65% <ø> (ø)
mmpose/models/heads/regression_heads/dsnt_head.py	86.48% <ø> (ø)
mmpose/apis/inferencers/utils/get_model_alias.py	20.00% <20.00%> (ø)
...heads/regression_heads/integral_regression_head.py	76.19% <33.33%> (-0.61%)	⬇️
mmpose/apis/inferencers/pose2d_inferencer.py	72.80% <40.00%> (-1.51%)	⬇️
mmpose/models/heads/coord_cls_heads/simcc_head.py	90.26% <50.00%> (+0.08%)	⬆️
mmpose/apis/inferencers/__init__.py	100.00% <100.00%> (ø)
mmpose/apis/inferencers/utils/__init__.py	100.00% <100.00%> (ø)
mmpose/models/heads/heatmap_heads/cpm_head.py	93.63% <100.00%> (+0.05%)	⬆️
mmpose/models/heads/heatmap_heads/heatmap_head.py	89.06% <100.00%> (+6.58%)	⬆️
... and 1 more

... and 1 file with indirect coverage changes

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