devel/py-setuptools: update to 57.0.0 preserving old version

• Copy devel/py-setuptools to devel/py-setuptools44 (for Python 2.7 support)
• Update devel/py-setuptool to 57.0.0 (adding support for Python 3.10)
• Update Mk/Uses/python.mk to chose between py-setuptools and py-setuptools44 based on Python version

This allows us to have latest setuptools and working Python 3.10
without breaking packages requiring Python 2 support for remaining
reports that require it.

Exp-run showed 3 ports failing to build with latest setuptools and
they were fixed.

PR: 256173
Exp-run by: antoine
Reviewed by: koobs (python)
Approved by: koobs (python)
Differential_Revision: https://reviews.freebsd.org/D30473