util: improve display of iterators and weak entries

This adds the number of not visible elements when inspecting iterators
while exceeding `maxArrayLength`.
It also fixes a edge case with `maxArrayLength` and the map.entries()
iterator. Now the whole entry will be visible instead of only the key
but not the value of the first entry.
Besides that it uses a slighly better algorithm that improves the
performance by skipping unnecessary steps.

PR-URL: https://github.com/nodejs/node/pull/20961


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>