Add security linting, request timeouts

[PGijsbers]

I added security linting through ruff. This is a reimplementation of (most) bandit checks, but in Rust. We will probably move over to ruff for all linting and formatting since its much faster, which is why I opted to use Ruff here instead of Bandit as was recommended in the audit.

[Taniya-Das]

I had a quick look at the changes, and they make sense to me, hence approving the PR. Let me know if you would like to take a more detailed look.