src: add ExclusiveAccess class

Similar to Rust's `std::sync::Mutex` in that it requires one to unwrap
the object before accessing it, acquiring the mutex in the process.

PR-URL: https://github.com/nodejs/node/pull/31717


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: David Carlier <devnexen@gmail.com>