[Task]: Re-use BatchConverterTest for different implementations

[TheNeuralBit]

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