- WAL package now can notify observers when it writes entries
- WAL can retrieve entries by sequence number
- WAL implements file retention management
- Add replication protocol defined using protobufs
- Implemented compression support for zstd and snappy
- State machine for replication added
- Batch management for streaming from the WAL
Adds a complete LSM-based storage engine with these features:
- Single-writer based architecture for the storage engine
- WAL for durability, and hey it's configurable
- MemTable with skip list implementation for fast read/writes
- SSTable with block-based structure for on-disk level-based storage
- Background compaction with tiered strategy
- ACID transactions
- Good documentation (I hope)
