Add Gauss-Legendre vector integration with specified number of nodes #32014
Description
From #30698.
We add a method integrate_vector_N.
Component: numerical
Author: Linden Disney-Hogg
Branch/Commit: 11feeb2
Reviewer: Samuel Lelièvre, Nils Bruin
Issue created by migration from https://trac.sagemath.org/ticket/32014