[Feature] Support VFIVimeo90K7FramesDataset

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #858 (b61e6e9) into master (0f01b67) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #858      +/-   ##
==========================================
+ Coverage   83.11%   83.15%   +0.03%     
==========================================
  Files         220      221       +1     
  Lines       12452    12475      +23     
  Branches     2017     2022       +5     
==========================================
+ Hits        10350    10373      +23     
  Misses       1785     1785              
  Partials      317      317              

Flag	Coverage Δ
unittests	83.11% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
mmedit/datasets/__init__.py	100.00% <100.00%> (ø)
mmedit/datasets/vfi_vimeo90k_7frames_dataset.py	100.00% <100.00%> (ø)
...ls/components/stylegan2/generator_discriminator.py	84.93% <0.00%> (-1.21%)	⬇️
mmedit/datasets/sr_folder_video_dataset.py	98.63% <0.00%> (+0.01%)	⬆️
mmedit/datasets/pipelines/formating.py	99.05% <0.00%> (+1.88%)	⬆️

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