chore: do not pass pairing as mut

tests: tweak one_max parameters

refactor: abstract pairing to n-ary

tests: adjust evolution one_max algorithm to always find optimum

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

chore: move env to codes/eoa_lib

feat: add evolution algorithm