src: implement NodePlatform::PostJob

V8 is starting to use the job API for Wasm compilation, so the node
platform should implement that.

PR-URL: https://github.com/nodejs/node/pull/35415


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>