Improve Compression Performance and Compatibility

Howdy PXB Team,

As we've discussed in the past, that while `qpress` was a good choice at the time it was made, LZ4 has advanced significantly since.  LZ4 can be built directly into PXB, removing a package dependency, and in typical benchmarks has a performance improvement in compression throughput of 20-30%.

I would like us to migrate PXB from relying on `qpress` to using LZ4 instead.

Thanks.