Add benchmark for memory and throughput of a fanout=3 data set for the baseline of optimizing the metadata subsystem

Merge pull request #1537 from cuiweixie/fix/stale-snapshot-log-message

Reduce reliance on some external crates

Fix stale snapshot removal log message

Merge pull request #1535 from spacejam/spacejam-patch-1

Update README.md

Apply clippy feedback

Merge pull request #1525 from spacejam/tyler_prefix_encoding

Fix bug with prefix encoding in merges

Keep debugging prefix compression

Fix bug with prefix compression

Implement prefix compression on btree nodes

Fix tests

Fix tests

Apply clippy suggestions