Add beeswarm plot to SHAP-IQ

[annprzy]

This PR addresses #399, adapting SHAP beeswarm plot to handle interactions and adding it to the plot module.

New features:

• shapiq/plot/beeswarm.py: adapts SHAP beeswarm plot to handle interactions
• tests/tests_plots/test_beeswarm.py: adds test for beeswarm plot

Updated:

• shapiq/__init__.py: adds beeswarm plot to the list of imports and __all__ attribute
• shapiq/plot/__init__.py: adds beeswarm plot to the list of imports and __all__ attribute

[mmschlk]

@annprzy, would it technically be possible to work without the skimage import? I see that you only require the conversion of color spaces there. I would love to not blow up the dependencies of shapiq too much and we already use colour or matplotlib which probably can also do what you need to do with skimage. Maybe the code would also work without the conversions even?

Second, I know you asked this in the issue, but if you do have some additional time for this, would you be able to add a quick tutorial for the plot under api_examples like the upset plot? This really does not need to be too elaborate but some quick showcase of the plot?

Thank you for this PR! :)