feat: split params out of PerturbationOperator to allow for non-'static PerturbationOperator

This means PerturbationOperators can now hold non-'static references.
Right away, utilize this in the Random2OptPerturbation for the TSPInstance.

tests(tsp): move tests to proper modules, fix uses

feat(tsp): add 2opt perturbation for subsequence reversal

refactor(tsp): split to multiple files out of tsp.rs