os: improve networkInterfaces performance

This algorithm uses less data transformations and is therefore
significantly faster than the one before.

PR-URL: https://github.com/nodejs/node/pull/22359


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>