Changed
- Deprecated `.kamu/datasets/<dataset>/cache` directory - a workspace upgrade will be required (see below)
- Support ingest source state per [ODF RFC-009](https://github.com/open-data-fabric/open-data-fabric/blob/master/rfcs/009-ingest-source-state.md)
- Introduced workspace-wide cache in `.kamu/cache`
- Introduced workspace versioning and upgrade procedure via `kamu system upgrade-workspace` command
- Upgraded to latest `datafusion` and `arrow`
Added
- New `kamu system gc` command to run garbage collector (currently only cleans up cache)