Lml/jit decorator

[lml131]

1、rename parrots.jit.pat as mmcv.jit
2、add tests for mmcv.jit, these test cases will pass under both pytorch and parrots environment

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #673 (f4faa28) into master (0d56211) will increase coverage by 0.15%.
The diff coverage is 86.07%.

@@            Coverage Diff             @@
##           master     #673      +/-   ##
==========================================
+ Coverage   64.79%   64.95%   +0.15%     
==========================================
  Files         135      136       +1     
  Lines        7835     7893      +58     
  Branches     1388     1399      +11     
==========================================
+ Hits         5077     5127      +50     
- Misses       2493     2499       +6     
- Partials      265      267       +2     

Flag	Coverage Δ
unittests	64.95% <86.07%> (+0.15%)	⬆️

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

Impacted Files	Coverage Δ
mmcv/fileio/file_client.py	89.43% <ø> (-0.17%)	⬇️
mmcv/runner/hooks/optimizer.py	23.75% <0.00%> (-1.25%)	⬇️
mmcv/utils/env.py	56.60% <0.00%> (ø)
mmcv/utils/parrots_jit.py	81.81% <81.81%> (ø)
mmcv/cnn/bricks/activation.py	100.00% <100.00%> (ø)
mmcv/runner/dist_utils.py	51.54% <100.00%> (+0.50%)	⬆️
mmcv/utils/__init__.py	87.50% <100.00%> (+0.83%)	⬆️
mmcv/utils/config.py	88.99% <100.00%> (+0.25%)	⬆️
mmcv/version.py	92.30% <100.00%> (ø)
mmcv/video/optflow.py	97.67% <100.00%> (+0.49%)	⬆️
... and 1 more

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[ZwwWayne]

LGTM now, please @hellock have a check.

[hellock]

Task linked: CU-5brfzn MMCV add parrots JIT API

[OpenMMLab-Assistant-007]

Hi!
@lml131
First of all, we want to express our gratitude for your significant PR in the OpenMMLab project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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