pynac: Replace direct use of singular's libfactory by a Python call #32613
Description
pynac has a dependency on libfactory's CanonicalForm class, for polynomial factorization, expansion, gcd, resultant.
We should replace this by a callback to a Python function.
$ git grep factory/factory src/sage/symbolic/
src/sage/symbolic/expression.pyx:# factory/factory.h so this ^ is needed to find it
src/sage/symbolic/ginac/mpoly-singular.cpp:#include "factory/factory.h"
src/sage/symbolic/ginac/numeric.cpp:#include "factory/factory.h"
Component: symbolics
Issue created by migration from https://trac.sagemath.org/ticket/32613