contrib: add a script to build all of the wheels on macOS This is mostly a translation of `contrib/packaging/build-windows-wheels.bat`, except the default pythons to build can be inferred from `setup.py` and/or `pyproject.toml`, and all use the same configuration. All we need to do is force the building of translation files, tell it to skip pypy wheels, and tell it to build universal2 wheels instead of for the current architecture.