Tutorial Request: archive-wide scientific meta-analysis

One of several issue tickets @satra requested to be opened for tracking purposes from the discussion in https://github.com/dandi/example-notebooks/pull/127#issuecomment-3881880703

Now that the archive has hundreds of Dandisets, it would be nice to have a tutorial that shows

Granted, our current ['search' tutorials](https://github.com/dandi/example-notebooks/tree/master/tutorials/cosyne_2023) do something analogous, but these stop short of actually using the data for anything scientific (no matter how simple; even a basic calculation being run on data across more than a handful of datasets is enough to showcase the intent)

I recall Kailin Zhuang from Kris Bouchard's group did something just like this at a recent NWB hackathon - I will ask them if they are able to post anything here