This ticket adds a package pyscipopt and adds a new MIP backend based on it.

https://github.com/scipopt/PySCIPOpt

Branch is on top of #31329.

Steps to get it to work:

• pull from this branch
• sage -f pyscipopt

Depends on #31329

CC: @mo271 @yuan-zhou @malb @dcoudert @dimpase

Component: linear programming

Keywords: days84, IMA-PolyGeom

Author: Matthias Koeppe, Moritz Firsching, Martin Rubey

Branch/Commit: 099c15b

Reviewer: Moritz Firsching, Vincent Delecroix, David Coudert, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/21003