Timeseriesflattener

Fix

* Use Union in pydantic basemodels ([`a80a9c2`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/a80a9c24c6eb7e0ceadba021eb4474325b560a38))

Fix

* Don't mix types in HasValuesAggregator fallback ([`dfdf5dd`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/dfdf5dd1417639e76ec1639f7c689464c1012f05))

Documentation

* Remove type hint in docstring ([`a4fe254`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/a4fe254e87a0796bd1f63d803e35e57e86ae8e34))
* Add docstring to flattener ([`64ee0b0`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/64ee0b09f8949cd85fa1345b371920ab5300749d))

Fix

* Expose ValueSpecification ([`b670fc8`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/b670fc891a2cdfcb4eed01d82fd9b3f627a5b9b8))

Fix

* Rename 'pred_time_uuid' to 'prediction_time_uuid' ([`fe44fd8`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/fe44fd8c0abd9c28009b5d38bfcad28fbfabbf86))

Fix

* Scrambled features with step size ([`6bdddbd`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/6bdddbdf975b25cee0e37398ea58ac6ba86f2e77))

Feature

* Bump release ([`879e752`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/879e752928808f8c3927808cab6a2f9a80a85610))