[Enhance] add inferencer

[cir7]

Motivation

[Enhance] add inferencer, update visualizer, add alias for some configs

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Base: 76.04% // Head: 75.82% // Decreases project coverage by -0.22% ⚠️

Coverage data is based on head (45d0383) compared to base (8f96223).
Patch coverage: 58.49% of modified lines in pull request are covered.

❗ Current head 45d0383 differs from pull request most recent head 5eb0359. Consider uploading reports for the commit 5eb0359 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2164      +/-   ##
===========================================
- Coverage    76.04%   75.82%   -0.22%     
===========================================
  Files          151      155       +4     
  Lines        11394    11688     +294     
  Branches      1881     1953      +72     
===========================================
+ Hits          8664     8863     +199     
- Misses        2298     2373      +75     
- Partials       432      452      +20     

Flag	Coverage Δ
unittests	75.82% <58.49%> (-0.22%)	⬇️

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

Impacted Files	Coverage Δ
mmaction/engine/hooks/visualization_hook.py	30.61% <0.00%> (ø)
...ptimizers/layer_decay_optim_wrapper_constructor.py	19.64% <19.64%> (ø)
mmaction/models/backbones/mvit.py	78.81% <26.47%> (-5.26%)	⬇️
mmaction/visualization/action_visualizer.py	70.19% <45.45%> (+2.23%)	⬆️
mmaction/datasets/transforms/loading.py	81.59% <57.69%> (+0.64%)	⬆️
mmaction/datasets/repeat_aug_dataset.py	75.86% <60.00%> (-8.46%)	⬇️
...maction/apis/inferencers/actionrecog_inferencer.py	73.83% <73.83%> (ø)
mmaction/visualization/video_backend.py	86.00% <80.00%> (+19.96%)	⬆️
mmaction/apis/inferencers/mmaction2_inferencer.py	84.61% <84.61%> (ø)
mmaction/apis/__init__.py	100.00% <100.00%> (ø)
... and 9 more

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[ly015]

• model alias, e.g. 'slowfast'
• config name, e.g. '...'
• config path, e.g. '...'