[Task]: Re-use BatchConverterTest for different implementations

### What needs to happen?

We have `BatchConverterTest` in `batch.py`, which is used to test the list and numpy implementations. As more `BatchConverter` implementations are added they will need to add tests that are almost identical to this one, with a few alterations:
- The test data, currently handled with `parameterized_class`.
- Possibly a custom equality check (e.g. `pd.testing.assert_frame_equal` for pandas)

We should make it possible to re-use the tests in `BatchConverterTest` without copy-pasting it, as this will lead to fragmentation.

### Issue Priority

Priority: 2

### Issue Component

Component: dsl-dataframe