noxious-server as a library

[cbgbt]

Is your feature request related to a problem? Please describe.
I'm currently invoking noxious-server via std::process::Command in a Rust module in my CI. This mostly works great!

I did have some issues though when debugging timing of the process coming up and successfully binding to a port, then also ensuring it is reliably killed.

Describe the solution you'd like
It might be nice to make the noxious-server package both a library and a binary, where the binary is a thin wrapper. I'm thinking that in CI, I'd have a choice to something something tokio::spawn(noxious_server.serve(...))

Describe alternatives you've considered
This isn't strictly required, and it does increase API surface of the package.

[cbgbt]

By the way, I'm happy to contribute code in general, just wanted to share some ideas I'd had while working with noxious.

[cbgbt]

I started skimming through the code and have realized that this may already be possible via core.

[oguzbilgener]

Yup, core has the server. What it doesn't have is the REST API and the store that keeps the proxies. I can definitely see the benefit of exposing the server as a library as well though.

Thank you for offering to contribute!