coordinate API with GraphOptim and move JuMP-dependent functionality there

[Krastanov]

If I understand correctly, GraphOptim exists as a home for all graph algorithms that require a MILP tool like JuMP.

In which case:

• [ ] the maximum/minimum perfect match functions based on the Blossom algorithm should probably stay here
• [ ] the maximum/minimum weight match (not perfect) that use the Hungarian algorithm and require JuMP should probably moved to GraphOptim
• [ ] the MatchingResult return type should be synchronized between the two libraries

Also need to be consistent with GraphOptim.min_cost_assignment and BipartiteMatching.jl