Use pyproject.toml to enable building and installing from source

[bkmgit]

Operating system: Linux Mint Debian Edition 6
wxPython version & source: wxPython 4.2.2 Pypi
Python version & source: python 3.11 system

Description of the problem:

Get the following warning when building:

DEPRECATION: wxPython is being installed using the legacy 'setup.py install' method, because it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. Discussion can be found at https://github.com/pypa/pip/issues/8559

The current build uses setup.py which is deprecated. Would switching to using a pyproject.toml configuration be something that would be supported? There is an old pull request at here, but am happy to update this or make a new one if it would be examined.