[Feature] Add RealBasicVSR backbone

[ckkelvinchan]

Paper: Investigating Tradeoffs in Real-World Video Super-Resolution

[codecov]

Codecov Report

Merging #632 (e7b6481) into master (deccc1d) will increase coverage by 0.03%.
The diff coverage is 88.37%.

@@            Coverage Diff             @@
##           master     #632      +/-   ##
==========================================
+ Coverage   80.37%   80.40%   +0.03%     
==========================================
  Files         197      198       +1     
  Lines       11126    11169      +43     
  Branches     1771     1780       +9     
==========================================
+ Hits         8942     8980      +38     
- Misses       1912     1914       +2     
- Partials      272      275       +3     

Flag	Coverage Δ
unittests	80.38% <88.37%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/models/backbones/__init__.py	100.00% <ø> (ø)
...models/backbones/sr_backbones/real_basicvsr_net.py	88.09% <88.09%> (ø)
mmedit/models/backbones/sr_backbones/__init__.py	100.00% <100.00%> (ø)
...ls/components/stylegan2/generator_discriminator.py	84.93% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update deccc1d...e7b6481. Read the comment docs.