[Feature] Add cutout and lighting

[LXXXXR]

Hi,
In this pull request, cutout and change the lighting are added. Pls kindly take a look. Thank you.

[codecov]

Codecov Report

Merging #909 (b1ded51) into master (933b052) will decrease coverage by 0.92%.
The diff coverage is 92.50%.

@@            Coverage Diff             @@
##           master     #909      +/-   ##
==========================================
- Coverage   65.91%   64.98%   -0.93%     
==========================================
  Files         147      148       +1     
  Lines        8986     9185     +199     
  Branches     1613     1650      +37     
==========================================
+ Hits         5923     5969      +46     
- Misses       2747     2898     +151     
- Partials      316      318       +2     

Flag	Coverage Δ
unittests	64.98% <92.50%> (-0.93%)	⬇️

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

Impacted Files	Coverage Δ
mmcv/image/geometric.py	94.19% <92.00%> (-0.28%)	⬇️
mmcv/image/photometric.py	99.26% <92.85%> (-0.74%)	⬇️
mmcv/image/__init__.py	100.00% <100.00%> (ø)
mmcv/cnn/bricks/registry.py	100.00% <0.00%> (ø)
mmcv/cnn/bricks/transformer.py	0.00% <0.00%> (ø)
mmcv/cnn/utils/weight_init.py	98.85% <0.00%> (+0.04%)	⬆️

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[ycxioooong]

LGTM