Explore performance improvements in RocksDB when using the Folly integration

[akhi3030]

Zulip discussion: https://near.zulipchat.com/#narrow/stream/313099-pagoda.2Fstorage/topic/10x.20rocksdb.20improvement.3F Tweet: https://twitter.com/MarkCallaghanDB/status/1580606178756681745 github link: https://github.com/facebook/rocksdb/wiki/RocksDB-Contribution-Guide#folly-integration

RocksDB now supports Folly integration which should help improve performance in high concurrency scenarios. We should investigate if this helps improves our performance as well.