v8: inspect unserializable objects

This would otherwise sometimes just print relatively useless
information about the value in question, such as `[object Object]`.

PR-URL: https://github.com/nodejs/node/pull/30167


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: David Carlier <devnexen@gmail.com>