doc: move module core module doc to separate page

The `module` core module is available for both CJS and ESM users, it
deserves its own page.

PR-URL: https://github.com/nodejs/node/pull/34747
Refs: https://github.com/nodejs/modules/issues/539


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>