util: add compact depth mode

This overloads the `compact` option from `util.inspect()`. If it's
set to a number, it is going to align all most inner entries on the
same lign if they adhere to the following:

* The entries do not exceed the `breakLength` options value.
* The entry is one of the local most inner levels up the the one
  provided in `compact`.

PR-URL: https://github.com/nodejs/node/pull/26269


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