[Fix] update github workflow, circleci and github templates

[zengyh1900]

1. update github workflow to enable testing on windows-cpu, windows-cu102, linux
2. update github template including pr template, issue template.
3. update circleci

[codecov]

Codecov Report

Base: 83.54% // Head: 83.86% // Increases project coverage by +0.32% 🎉

Coverage data is based on head (2ed2545) compared to base (1c18d05).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1087      +/-   ##
==========================================
+ Coverage   83.54%   83.86%   +0.32%     
==========================================
  Files         223      223              
  Lines       12830    12738      -92     
  Branches     2096     2096              
==========================================
- Hits        10719    10683      -36     
+ Misses       1783     1716      -67     
- Partials      328      339      +11     

Flag	Coverage Δ
unittests	83.86% <100.00%> (+0.35%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/apis/train.py	30.08% <ø> (ø)
mmedit/core/mask.py	97.72% <ø> (ø)
mmedit/core/utils/dist_utils.py	56.25% <ø> (ø)
mmedit/datasets/base_matting_dataset.py	100.00% <ø> (ø)
mmedit/datasets/base_sr_dataset.py	100.00% <ø> (ø)
mmedit/datasets/base_vfi_dataset.py	100.00% <ø> (ø)
mmedit/datasets/comp1k_dataset.py	100.00% <ø> (ø)
mmedit/datasets/img_inpainting_dataset.py	28.57% <ø> (ø)
mmedit/datasets/pipelines/augmentation.py	98.85% <ø> (-0.05%)	⬇️
mmedit/datasets/pipelines/blur_kernels.py	84.55% <ø> (ø)
... and 88 more

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