[Feature] add cummax/cummin tensorrt plugin

[grimoire]

Hi,
This PR adds cummax/cummin support to TensorRT.

[codecov]

Codecov Report

Merging #1031 (824d29d) into master (b8c09f3) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1031      +/-   ##
==========================================
- Coverage   65.30%   65.29%   -0.01%     
==========================================
  Files         154      154              
  Lines        9891     9899       +8     
  Branches     1801     1803       +2     
==========================================
+ Hits         6459     6464       +5     
- Misses       3099     3104       +5     
+ Partials      333      331       -2     

Flag	Coverage Δ
unittests	65.29% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
mmcv/tensorrt/tensorrt_utils.py	1.86% <0.00%> (-0.05%)	⬇️
mmcv/runner/hooks/logger/tensorboard.py	34.37% <0.00%> (-1.11%)	⬇️
mmcv/runner/hooks/logger/pavi.py	71.01% <0.00%> (+0.42%)	⬆️
mmcv/runner/hooks/logger/mlflow.py	81.25% <0.00%> (+0.60%)	⬆️
mmcv/runner/hooks/logger/wandb.py	69.69% <0.00%> (+0.94%)	⬆️
mmcv/runner/hooks/logger/base.py	70.87% <0.00%> (+1.94%)	⬆️

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[RunningLeon]

LGTM