[ZijunLee]

Summary

• add EvaluatorWithCache to avoid reevaluating identical decision variables
• cache and restore both objective and constraint values
• deduplicate repeated solutions within the same batch while preserving the original list order
• support evaluators that return copied solutions, such as process-based evaluators
• document usage with parallel evaluators

Validation

• make lint
• make test — 1118 passed
• make docs-build
• make package

Closes #184