sysutils/py-pywatchman: Update to v2023.04.24.00

Reordering done for portclippy.
Add more description from upstream repo to pkg-descr for portlint.
Lowering the first character of BROKEN message to portlint.
Replacing the PORTVERSION with DISTVERSION.
testing their weird versioning schema with pkg version.
Also replaced the USES= python:3.6+ with USES= python.
Patch setup.py file.
Add watchman directory in WRKSRC_SUBDIR

Submitter becomes maintainer. Already maintainer of other ports.

Changelog: https://github.com/facebook/watchman/releases/tag/v2023.04.24.00

PR: 271056