Add pre-commit configuration

[akx]

What does this PR do?

This PR adds a pre-commit configuration, so developers may opt in to running ruff and ruff-format as a pre-commit hook.

Should reduce the need for "fix lint" commits and check_code_quality CI failures.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
  • Added to contributing readme.
• Did you write any new necessary tests?
  • None required.

Who can review?

cc @muellerzr @BenjaminBossan

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[BenjaminBossan]

Same comment as I've had for PEFT: I don't know yet if I'd personally use it, but since it's completely optional, there is no harm in adding this.

[muellerzr]

Thanks! Same comment as Benjamin, but no harm in having it available :)