Implement SparseMultipartite and exact computation of SOS polytope like SOSTools

[blegat]

• Multipartite (done in SOSTools): ✨ Add multipartite newton polytope computation #69
• Exact with V-representation -> H-representation conversion (done in SOSTools with CDD), we can use Polyhedra for that
• Exact by solving an LP for each monomial (done in YALMIP), we could also rely on Polyhedra for that