[pyOpenSci review] develop plan on whether to put nanoplots code into separate library

[rich-iannone]

From the pyOpenSci comment:

issue (_utils_nanoplots.py): I am a little on the fence about this file. It seems a little out of place, and I would not be surprised if this was extracted in its own package, just like htmltools. It has a LOT of content, its scope is way bigger than other files: data validation, statistic computation, and the actual SVG build. The thousand lines long function seems high maintenance as well.

pyOpenSci/software-submission#202 (comment)

[machow]

We plan to circle back to this, and have noted it, but I'm going to close here for now.