Enable compression across all RAM Cache algorithms

We currently only support RAM compression for the CLFUS ram cache eviction algorithm. It would be helpful to support it for the S3-FIFO and LRU cache eviction algorithms as well.

Proposed four-step process:
- Ensure LRU and S3-FIFO honor the `copy` parameter
- Fix locking in CLFUS `compress_entries`
- Extract compression out of CLFUS into its own class
- Add compression to LRU and S3-FIFO and update documentation