Implement an alternative to pygmo

[fwitte]

pygmo requires conda on windows, I would prefer a pure pip variant. What can be done is to change the implementation of the OptimizationProblem slightly to be compatible with another package, for example pymoo.

[fwitte]

This is even worse: On Ubuntu 24.04 with python 3.11 pygmo seems to be bugged. I will implement the alternative asap and remove pygmo.