Replace hyper with axum

[rukai]

Simplifies the implementation of our configuration webservers and removes the duplicate hyper dependency.

Currently this PR regresses release build time by 9s on my machine.
I thought we might win back some build time by the removal of hyper 0.14 but in this measurement of 9s I have already removed hyper 0.14

Not sure if its worth proceeding with this cost to build time.

[rukai]

I've thought about it and I think we should just go ahead with this.
We dont want to be stuck on an unmaintained version of hyper.
And the swap to axum makes our http servers simpler, more robust and more easily extensible for any future runtime configuration needs.
So i think that for now its worth the additional 9s on release builds.

We should however be on the lookout for an http server of similar quality and ease of use as axum, but something a bit simpler since we dont need the most flexible http server.
If we find such a crate we can always swap to it in the future.

[rukai]

hyperium/hyper-util#110 Someone created an example demonstrate using hyper 1.0 as a server, might be worth trying it out before landing this.
The design in #1529 would benefit greatly from a proper webserver, so lets go ahead with this.