doc: add metadata for vm code generation options

Add changes entries for vm.createContext codeGeneration
option and script.runInNewContext contextCodeGeneration
option.

PR-URL: https://github.com/nodejs/node/pull/19440
Fixes: https://github.com/nodejs/node/issues/19419
Refs: https://github.com/nodejs/node/pull/19016


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>