[Enhance] Support MMCLI

[RangiLyu]

Support installing MMDetection with MMCLI.

[codecov]

Codecov Report

Merging #5143 (bc73afa) into master (6f6c228) will decrease coverage by 0.18%.
The diff coverage is n/a.

❗ Current head bc73afa differs from pull request most recent head 0d42fa1. Consider uploading reports for the commit 0d42fa1 to get more accurate results

@@            Coverage Diff             @@
##           master    #5143      +/-   ##
==========================================
- Coverage   64.90%   64.72%   -0.19%     
==========================================
  Files         267      267              
  Lines       20655    20560      -95     
  Branches     3477     3477              
==========================================
- Hits        13407    13307     -100     
  Misses       6489     6489              
- Partials      759      764       +5     

Flag	Coverage Δ
unittests	64.72% <ø> (-0.17%)	⬇️

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

Impacted Files	Coverage Δ
mmdet/models/dense_heads/rpn_test_mixin.py	77.41% <0.00%> (-6.46%)	⬇️
mmdet/models/detectors/base.py	52.54% <0.00%> (-2.66%)	⬇️
mmdet/models/roi_heads/base_roi_head.py	85.29% <0.00%> (-2.21%)	⬇️
mmdet/core/bbox/coder/yolo_bbox_coder.py	58.97% <0.00%> (-2.01%)	⬇️
mmdet/models/roi_heads/test_mixins.py	50.58% <0.00%> (-1.75%)	⬇️
mmdet/core/export/onnx_helper.py	30.76% <0.00%> (-1.49%)	⬇️
mmdet/models/detectors/htc.py	87.50% <0.00%> (-1.39%)	⬇️
mmdet/models/necks/pafpn.py	38.29% <0.00%> (-1.29%)	⬇️
mmdet/core/bbox/samplers/base_sampler.py	73.17% <0.00%> (-1.25%)	⬇️
mmdet/models/dense_heads/base_dense_head.py	89.47% <0.00%> (-1.01%)	⬇️
... and 35 more

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