chore: split constr main to multiple files

feat: implement improved nsga for constraints with archive of feasible solutions

fix: use two objectives in nsga_constr

feat: implement feasible crossover wrapper

feat(constr_hw02): Add nsga_constr algorithm

feat: implement constrained nsga

feat: save constraint violation average

feat(constr_hw02): g04, g05, g09 and g21

Lots of changes I lost track of

feat: use stochastic ranking for constr_hw02

fix: implement possibility of best candidate not being found

fi: stochastic ranking properly compares constraints only

feat: add bounded crossover similar to bounded perturbation

feat: declare problems for hw02

chore: add hw02

fix: constraint for ArithmeticCrossover

feat: Add BlendCrossover for reals

feat: add ArithmeticCrossover for reals

fix: make sure both parents are used for ovector one point

feat: add convenient function for stochastic ranking evaluation