[Feature] Support not to register lr scheduler hook

[nbei]

No description provided.

[codecov]

Codecov Report

Merging #774 (57bb2c4) into master (643009e) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #774      +/-   ##
==========================================
- Coverage   62.65%   62.63%   -0.02%     
==========================================
  Files         139      139              
  Lines        8271     8273       +2     
  Branches     1486     1487       +1     
==========================================
  Hits         5182     5182              
- Misses       2820     2821       +1     
- Partials      269      270       +1     

Flag	Coverage Δ
unittests	62.63% <0.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
mmcv/runner/base_runner.py	68.37% <0.00%> (-0.65%)	⬇️

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[hellock]

The linting fails.