Add normalizing for `\r` style newlines (#4710)

* Normalize newlines

* Fix tired mistakes

* Add changelog entry

* Update documentation

* Move changes to preview

* Fix test formatting

* Update schema

* Fix typo in CHANGES.md

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* Fix typo in docs/the_black_code_style/future_style.md

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>