Implement a backend running the kernel in the same process using lupa

[KOLANICH]

https://github.com/scoder/lupa

[guysv]

cool idea! I'm not planning on retiring the old IPC based solution. While there are drawbacks, not having to deal with ABIs and being able to run everything that behaves '/bin/lua-like' is a feature that's gonna be lost within lupa.

Sure there's room for having them both, I just don't have ambition to code that. If you're up to the task tho, I'd be happy to merge it in!