feat: add MaximizingOperator

chore: guard test imports by #[cfg(test)]

chore: split types and functions to separate module files

tests: let EqualTerminatingCondition remember matches to return even if no longer equal

tests: For local search test, wait 100 cycles after optimum found

feat: add AndTerminatingConditions that ands multiple conditions

chore: rename NoMatchForTerminatingCondition to NoBetterForTerminatingCondition

Initial commit