feat(binary_string): add single bit perturbation, flip perturbation

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.

refactor: do perturbation in place instead of cloning

feat: add mutation and combined perturbations

chore: move env to codes/eoa_lib