User notebook showcasing SpatialData speed

[berombau]

Is your feature request related to a problem? Please describe.
Right now there is no clear showcase of the performance and speed of the SpatialData library, while this is one of it's big benefits.

Describe the solution you'd like
Create a notebook opening a large dataset, plotting the overview, querying a subset, aggregating signal and plotting results as quickly. Show the time with a counter and %%timeit per cel.

Describe alternatives you've considered
There is no clear plot of this in the paper. It's similar also to the plotting performance notebook, but more general.

Additional context
Add any other context or screenshots about the feature request here.

[berombau]

This should probably be an intermediate notebook, as IPython magics would be confusing to new users.