style: let git blame ignore black and isort only commits

I listed large commits that only change style, by applying black and/or isort, but no contents, into .git-blame-ignore-revs, that way GitHub's blame view automatically ignores then, and the CLI git blame can also ignore them with the option `--ignore-revs-file=.git-blame-ignore-revs`.
joanise · Nov 4, 2022 · 56896de · 56896de
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commit 56896de
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diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
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+cd3165733bbb5cd21b28aa2a3115cc13887dfa90
+9b156b87b63f6ff3c337c3e82ec1ecc45a2af03a
+d6ae834863d309cd05096d32c7237eea35e21615
+ce0a4b1b2aca9c3e3dcb09dc473c44e9014cc103
+1fa3d9d34b4087c44047df64fb0f936db73cb09f