[CI] Add CI for windows and redesign CI

[wutongshenqiu]

Motivation

Refer pr: open-mmlab/mmediting#732.

[codecov]

Codecov Report

Merging #95 (480ee94) into master (3b6423d) will increase coverage by 0.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   56.58%   57.18%   +0.59%     
==========================================
  Files          83       83              
  Lines        2932     2966      +34     
  Branches      540      540              
==========================================
+ Hits         1659     1696      +37     
+ Misses       1197     1191       -6     
- Partials       76       79       +3     

Flag	Coverage Δ
unittests	57.14% <ø> (+0.56%)	⬆️

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

Impacted Files	Coverage Δ
mmrazor/core/hooks/search_subnet.py	0.00% <0.00%> (ø)
mmrazor/core/searcher/greedy_search.py	0.00% <0.00%> (ø)
mmrazor/core/runners/iter_based_runner.py	0.00% <0.00%> (ø)
mmrazor/core/searcher/evolution_search.py	0.00% <0.00%> (ø)
mmrazor/core/runners/epoch_based_runner.py	0.00% <0.00%> (ø)
mmrazor/models/mutators/differentiable_mutator.py	97.50% <0.00%> (+0.06%)	⬆️
mmrazor/models/mutators/one_shot_mutator.py	96.42% <0.00%> (+0.13%)	⬆️
mmrazor/models/algorithms/autoslim.py	71.31% <0.00%> (+0.77%)	⬆️
mmrazor/models/algorithms/base.py	62.74% <0.00%> (+1.12%)	⬆️
mmrazor/models/pruners/structure_pruning.py	88.39% <0.00%> (+2.24%)	⬆️
... and 3 more

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