src: move OnMessage to node_errors.cc

Rename the per-isolate message listener to `PerIsolateMessageListener`
and move it to `node_errors.cc` since it's part of the error
handling process. It also creates an external reference so it needs
to be exposed in `node_errors.h` for a snapshot builder to know.

PR-URL: https://github.com/nodejs/node/pull/27304


Reviewed-By: Anna Henningsen <anna@addaleax.net>