[CBC interface] Add hint handling#5215
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Hi, the PR adds support for setting CBC hints and making use of them.
I could not find a test within ortools that measures hints impact consistently across solvers (that's implementation dependent and requires looking into either logs, comparing solver time or look into internal iterations and would take a considerable effort).
The included (java only) tests help verifying correctness of the solution when hints are provided.
This also covers other solvers whose implementations I did not touch. I could not find other tests covering hint/no-hint correctness comparisons.
I'd be happy to get some feedback and adjust the PR accordingly, please let me know what you think.