Grace shutdown

[miky-rola]

• Add function to shutdown server without any dependencies

[Az107]

Amazing job!
Give me some time to review this and run a few tests before merging.
But this looks really impressive!

[Az107]

Its a great job , but a couple of request.
first we can move this methods and mods about the graceful shutdown to a mod in
maybe src/utils.rs or its own.
For the unix implementation its better to finally use libc
that will reduce it to something more like the windows one

extern "C" fn handle_sigint(_: i32) {
    println!("\SIGINT recibed (Ctrl+C). Quiting...");
    std::process::exit(0);
}

    unsafe {
        libc::signal(libc::SIGINT, handle_sigint as usize);
    }

[Az107]

LGTM