gh-57187: Add support for extended attributes on FreeBSD

[worr]

Extended attributes are supported on FreeBSD, but have
a different API than on Linux. This implements a compatibility
layer so that the same set of python functions map to the
equivalent FreeBSD functions.

This is the patch for issue: https://bugs.python.org/issue12978

https://bugs.python.org/issue12978

• Issue: Figure out extended attributes on BSDs #57187

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

I'm a bot set up to make sure that the project can legally accept your contribution by verifying you have signed the PSF contributor agreement (CLA).

Unfortunately we couldn't find an account corresponding to your GitHub username on bugs.python.org (b.p.o) to verify you have signed the CLA. This is necessary for legal reasons before we can look at your contribution. Please follow the steps outlined in the CPython devguide to rectify this issue.

Thanks again to your contribution and we look forward to looking at it!

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[iritkatriel]

This has merge conflicts now.

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[arhadthedev]

Superseded by gh-103994.