Setup pre-commit hooks configuration #5136
Merged
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I've started by applying https://github.com/asottile/pyupgrade tool but found that we can get benefits from other hooks as well.
I don't clean up the linter step on CI. For now, let's apply the PR and drop duplicated checks later.
Also, I did not apply pyupgrade converter results to the PR because I want to backport configuration to 3.7/3.8 branches first and apply fixers in separate commits.