Added
- Added stubs for `beancount.ingest.{cache,importer,regression_pytest}`
Changed
- Replaced poetry with rye for the build system
- Switched to namespace packages to play better with pyright
- `Posting.units` is `Optional` now
- Better `_replace` signatures for all core datatypes
- Relaxed selected types for `realization.pyi`
- Allow `FrozenSet` to be passed as `tags` or `meta`