Function spawn_async_with_fds

pub fn spawn_async_with_fds<P>(
    working_directory: P,
    argv: &[&str],
    envp: &[&str],
    flags: SpawnFlags,
    child_setup: Option<Box<dyn FnOnce()>>,
    stdin_fd: Option<impl AsFd>,
    stdout_fd: Option<impl AsFd>,
    stderr_fd: Option<impl AsFd>,
) -> Result<Pid, Error>
where
    P: AsRef<Path>,