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: 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

feat: declare problems for hw02