Gallery scraper: facilitate animated output of examples, e.g. via napari-animation

[psobolewskiPhD]

🧰 Task

Some of the napari examples, particularly 3D ones, are just begging to be animated!
Would be cool to maybe use napari-animation and some keyframes to generate simple rotations or flythroughs and then have the animation (gif? png? mp4) in the output.

napari-animation does have a way of showing the animation in a notebook cell output:
napari/napari-animation#170
and
napari/napari-animation#171