[Feature] Add FeedbackBlockHeatmapAttention

[Yshuo-Li]

Based on #345

[codecov]

Codecov Report

Merging #350 (8becade) into master (d659415) will increase coverage by 0.18%.
The diff coverage is 98.14%.

❗ Current head 8becade differs from pull request most recent head 4bbbe1c. Consider uploading reports for the commit 4bbbe1c to get more accurate results

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
+ Coverage   80.13%   80.32%   +0.18%     
==========================================
  Files         182      182              
  Lines        9604     9604              
  Branches     1400     1396       -4     
==========================================
+ Hits         7696     7714      +18     
+ Misses       1717     1699      -18     
  Partials      191      191              

Flag	Coverage Δ
unittests	80.29% <98.14%> (+0.17%)	⬆️

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Impacted Files	Coverage Δ
mmedit/models/backbones/sr_backbones/dic_net.py	98.14% <98.14%> (-1.86%)	⬇️
mmedit/models/extractors/feedback_hour_glass.py	100.00% <0.00%> (ø)
...ls/components/stylegan2/generator_discriminator.py	86.14% <0.00%> (+1.20%)	⬆️
mmedit/apis/train.py	20.98% <0.00%> (+2.98%)	⬆️

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[innerlee]

This can be target to master now