[Feature] Support Ref-SR inference

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #716 (42436fe) into master (933220a) will increase coverage by 0.12%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master     #716      +/-   ##
==========================================
+ Coverage   81.80%   81.92%   +0.12%     
==========================================
  Files         211      212       +1     
  Lines       11896    11957      +61     
  Branches     1912     1923      +11     
==========================================
+ Hits         9731     9796      +65     
+ Misses       1869     1863       -6     
- Partials      296      298       +2     

Flag	Coverage Δ
unittests	81.90% <25.00%> (+0.11%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/apis/restoration_inference.py	15.38% <25.00%> (-1.29%)	⬇️
mmedit/apis/__init__.py	100.00% <0.00%> (ø)
mmedit/apis/video_interpolation_inference.py	91.22% <0.00%> (ø)
...t/models/video_interpolators/basic_interpolator.py	97.32% <0.00%> (+0.02%)	⬆️
...ls/components/stylegan2/generator_discriminator.py	86.14% <0.00%> (+1.20%)	⬆️
mmedit/models/video_interpolators/cain.py	100.00% <0.00%> (+4.00%)	⬆️
mmedit/apis/matting_inference.py	39.02% <0.00%> (+19.51%)	⬆️

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