vm: move process.binding('contextify') to internalBinding

PR-URL: https://github.com/nodejs/node/pull/22419
Refs: https://github.com/nodejs/node/issues/22160


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>