generating function of integral points of polyhedra #22067
Description
Implement this using MacMahon's Omega operator (#22066).
CC: @cheuberg @jplab @braunmath @slel
Component: geometry
Author: Daniel Krenn
Branch/Commit: 6f97db0
Reviewer: Matthias Koeppe
Issue created by migration from https://trac.sagemath.org/ticket/22067