chore: switch to pyproject.toml

[duttonw]

Per: #235 (comment)

[duttonw]

Hi (@ThrawnCA , @JVickery-TBS , @amercader , @davidread , @kowh-ai , @pdelboca , @wardi )

Can you confirm and let me know if you are happy to be listed on the authors/maintainers as well as if that is your preferred email address.

I've ordered the authors based on most recent work as well as most contributions and maintainers via pypi listing. (tho with how we have just configured github actions auto deploy, that list may need to reflect who has 'maintainer' rights on this project (who can cut versions etc).

Regards,

@duttonw

[ThrawnCA]

@duttonw I'd prefer to use my work email for this repo.