feat: move atuin-server to its own binary (#3112)

A combined binary was an early dev decision, when I thought most users
would be self hosting. It is now clear that in actual fact, most users
do not self host. So let's avoid forcing every user to have a copy of
the server literally linked in, and let's stop building server deps over
and over.

The deployment for this shouldn't change. `dist` will build a binary for
this automatically, and will also add it to the installer. The latter is
perhaps something we should explore changing too!

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## Checks
- [ ] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [ ] I have checked that there are no existing pull requests for the
same thing

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