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

refactor: add possibility to use different logic for obtaining best candidate

fix(eoa_lib): extract random distribution parameter out of perturbation

feat: add multi objective; NSGA

feat: add stochastic ranking

feat: add equal to BetterThan operator

feat: add multiple weights to constrained functions

feat: add number of constraints as a generic

feat: add possibility to map EvolutionResult evaluations

chore: remove Copy from requirement of TournamentSelection

refactor(tsp): Do not allocate in binary string fitness function

Currently the fit function has allocated for each individual!
That slows it down terribly!

This reimplements it to implement the fit_population, reusing
the same node permutation and same precedence_count

refactor(lib): Allow fitting whole population at once

The fitness function gets fit_population function. The default
implementation is going over fit() one by one, but it can be
reimplemented by specific types.

feat(lib): constraints along with evolutionary strategies

chore: fix warnings

feat(lib): allow modifying fitness function in evolution_algorithm

chore: move population structs to separate module