Implement blackd python client (#4774)

* feat: implement blackd python client

This class allows to easily send code to be
formatted by blackd.

* chore: fixed CHANGES.md

Wrong number

* chore: apply suggestions from code review

Fixes:
- Typos
- Wrong option reference

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Cooper Lees <me@cooperlees.com>