Openassetio-manager-bal

New features

- Added support for `getRelatedReferences` queries against a BAL library. See `schema.json` for library syntax, there is an additional
example in the function's [test library](./tests/resources/library_business_logic_suite_related_references.json). [17](https://github.com/OpenAssetIO/OpenAssetIO-Manager-BAL/issues/17)

Improvements

- Improved error messaging for missing entities and malformed entity references - it now contains the relevant string to aid debugging.

- Bumped OpenAssetIO version to `v1.0.0a8`.

Breaking changes

- Management policy queries will no longer fall back to a hardcoded default if no policy was found in the library, and will raise an exception instead. If a `managementPolicy` is defined in the JSON library, then the JSON schema requires both `read.default` and `write.default` policies to be defined. [6](https://github.com/OpenAssetIO/OpenAssetIO-Manager-BAL/issues/6)

Breaking changes

- Renamed the top-level python package to `openassetio_manager_bal`. [9](https://github.com/OpenAssetIO/OpenAssetIO-Manager-BAL/issues/9)

New features

- BAL now exposes an `openassetio.manager_plugin` entry point, and can be installed via `python -m pip` or similar. This allows it to be use with OpenAssetIO without needing to extend `OPENASSETIO_PLUGIN_PATH`. [9](https://github.com/OpenAssetIO/OpenAssetIO-Manager-BAL/issues/9)

Initial release