util: show Weak(Set|Map) entries in inspect

This adds support for WeakMap and WeakSet entries in `util.inspect`.
The output is limited to a maximum entry length of `maxArrayLength`.

PR-URL: https://github.com/nodejs/node/pull/19259
Fixes: https://github.com/nodejs/node/issues/19001

:
Reviewed-By: Yosuke Furukawa <yosuke.furukawa@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>