add pre-commit action

[edward-io]

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Summary:

Test plan:

Fixes #{issue number}

[codecov]

Codecov Report

Merging #60 (ea394e7) into main (47c0189) will increase coverage by 1.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   82.25%   83.62%   +1.36%     
==========================================
  Files          24       24              
  Lines        1826     1826              
==========================================
+ Hits         1502     1527      +25     
+ Misses        324      299      -25     

Impacted Files	Coverage Δ
torchsnapshot/scheduler.py	95.19% <ø> (+2.18%)	⬆️
torchsnapshot/io_preparer.py	94.38% <0.00%> (+0.70%)	⬆️
torchsnapshot/snapshot.py	97.28% <0.00%> (+2.98%)	⬆️
torchsnapshot/io_types.py	82.81% <0.00%> (+3.12%)	⬆️
torchsnapshot/torch_dist_checkpoint/resharding.py	66.66% <0.00%> (+3.33%)	⬆️
torchsnapshot/pg_wrapper.py	95.55% <0.00%> (+6.66%)	⬆️

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