add .git-blame-ignore-revs to hide formatting changes in git blame

[njzjz]

See https://docs.github.com/en/repositories/working-with-files/using-files/viewing-a-file#ignore-commits-in-the-blame-view

Note: it only works for git blame (or GitHub blame page) but does not work for git history (or GitHub file history page).

[codecov-commenter]

Codecov Report

Base: 82.39% // Head: 82.39% // No change to project coverage 👍

Coverage data is based on head (e11c77d) compared to base (4f1a911).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##            devel     #419   +/-   ##
=======================================
  Coverage   82.39%   82.39%           
=======================================
  Files          67       67           
  Lines        5963     5963           
=======================================
  Hits         4913     4913           
  Misses       1050     1050           

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