Add interactive tests for the `bdv` module

On top of the existing pytest tests, we should have a few _interactive_ tests for the `bdv` module (cf. #36).

They can also serve as nice examples on how to use it in Fiji scripts.

✨ [Common testing with ImageJ2 / Fiji](https://github.com/imcf/python-imcflibs/blob/devel/TESTING.md#common-testing-with-imagej2--fiji)