refactor: pass rng as argument

Instead of having the Rng stored
inside the structs, pass it through
the functions. This means it's no longer
necessary to pass perturbations etc. as mutable.

tests: add simple test for evolution on one_max

refactor: do perturbation in place instead of cloning

fix: tournament selection in case last wins returned wrong index

fix: tournament replacement strategy could be using wrong indices

feat: add best replacement

feat: add best selection

fix: return proper indices from tournament

feat: add mutation and combined perturbations

chore: make library out of eoa_lib

chore: move env to codes/eoa_lib