[Feature] Add Real-ESRGAN checkpoint

[ckkelvinchan]

Paper: Real-ESRGAN: Training Real-World Blind Super-Resolution with Pure Synthetic Data

[codecov]

Codecov Report

Merging #635 (4e8f43d) into master (deccc1d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #635   +/-   ##
=======================================
  Coverage   80.37%   80.37%           
=======================================
  Files         197      197           
  Lines       11126    11126           
  Branches     1771     1771           
=======================================
  Hits         8942     8942           
  Misses       1912     1912           
  Partials      272      272           

Flag	Coverage Δ
unittests	80.35% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...ls/components/stylegan2/generator_discriminator.py	84.93% <0.00%> (ø)

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