[2.0.x] evolution of MenuSource source plugin

Problem/Motivation

Factorize the code of MenuSource, and introduce a new static method, that would allow external callers,
like ui_suite themes, to easily get the links from a menu (with options), with a one line code.

this is particularly usefull in page.html.twig presenter templates, when one need to inject values to links prop types, to components such as footer or header.
typical use case here is ui_suite_dsfr