wasi: add returnOnExit option

This commit adds a WASI option allowing the __wasi_proc_exit()
function to return an exit code instead of forcefully terminating
the process.

PR-URL: https://github.com/nodejs/node/pull/32101
Fixes: https://github.com/nodejs/node/issues/32093


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>