* feat: Implement write buffer to Parquet snapshotting
This introduces snapshot to the server packages to manage snapshotting. It also introduces a new trait for representing a Partition. There is a very crude API wired up in http_routes for testing purposes. Follow on work will bring the server package into http_routes and rework the snapshot API.
* chore(server): add logs for dropped WAL segments
Added logging for dropped writes and old segments in rollover scenarios
Also including a dep on tracing and dev-dep on test_helpers
Refs: #466
* chore(server): Add more context to logs
Minor cleanup around remove_oldest_segment usage
Suggestions from @alamb's review
Paul Dix
Matt Freitas-Stavola
Andrew Lamb
Paul Dix