Bounded Adam solver (at least box constraints)

[TorkelE]

Might already exist, but this would be really useful to have.

So Adam generally is non-constrained, however, it can be made constrained by modifying the loss function. But it would be nice to have a version of the solver which does this directly. Two reasons:

• Can potentially add a nicer way of dealing with the constraints than the user can code).
• Can deal with OptimizationProblems that have lbandub` defined.

This second one is important, as right now I cannot solve the same problem with BBO_adaptive_de_rand_1_bin_radiuslimited and Adam. It would be nice to use two solvers like this without having to juggle two different (but almost identical) Optimizationproblems.