Add a pre-commit hook which ensures `uv.lock` is up to date

**Motivation**
It's possible to de-sync with the lockfile if we don't have a pre-commit check for this.
As a pre-commit hook it can be fixed automatically and also we can check it on CI.

Should look at https://github.com/astral-sh/uv-pre-commit to see if there's a satisfactory solution

**Summary of desired enhancement**
Ability to check the lockfile is up-to-date in CI and pre-commit.
