Optimize simulated annealing

[mlarocca]

Produce a production-ready version of simulated annealing with the following optimizations:

• Minimal delta cost computation: directly compute the delta using only the changed data
• Avoid cloning: instead of cloning current solution, create a rollback callback/instructions that will undo the changes, if the transition is rejected.
• Cost delta and rollback should be computed directly in the transition method