security/py-biscuit-auth: Convert build to use PEP 517 and rename to PyPI name

[michaelo]

Summary

• Rename port to PyPI name according to Python policy
• Move build completely to PEP 517
• Bump consumers: www/bunkerweb/Makefile
• Simplify Python discovery; the build frontend will pass the interpreter

New name: security/py-biscuit-python

PR: 297823

[michaelo]

@vishwin, I have picked up your comments and https://wiki.freebsd.org/Python/PortsPolicy#PORTNAME and made this port right.

[michaelo]

• Simplify Python discovery; the build frontend will pass the interpreter