WIP - Update versioning

[trallard]

There is no associated issue, but this PR tackles a couple of maintenance tasks:

• Adds hatch-vcs to handle versioning (including dev versions, which should fix the release action). For example, locally for this PR:

   $ hatch version
   # returns
   2024.6.2.dev29+g2460535

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

Additional information

I re-added the publish to test-PyPI on every push to the main (this was previously broken but should be fixed now using VCs).

How to test

The easiest way to test is by checking the local version of the packages with hatch version, and launching conda-store-server with docker compose.
The rest: building Docker images, etc. should be tested through our CI.

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