Add UV as a package manager option

Zebedee Nichollsrequested to merge
uv-backend into main

Description

I'm playing around with this in magicc/magicc!14

Checklist

Please confirm that this pull request has done the following:

  • Tests added
  • Documentation added (where applicable)
  • Changelog item added to changelog/
  • Ran make ctt locally

cc @lewisjarednz @mikapfl

Edited by Zebedee Nicholls

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