support ArrayLike data in to_xarray

[egpbos]

This commit makes dianna swallow more kinds of data items without users having to mangle them manually themselves. As long as your data is numpy ArrayLike it will go. The only blocker for this was the direct use of the .ndim attribute on data, which assumes it is already a numpy array rather than something that can trivially be converted to a numpy array. A PIL.Image is an example of such an ArrayLike type. We use this in explainable_embedding to feed items into the OpenAI CLIP model.

I sprinkled in some nice type hinting, of course, but not for the other parameters, because they would become monstrosities.