feature: proper support of matplotlib like in Jupyter

[maartenbreddels]

In https://github.com/widgetti/solara/commit/2b321eeff9f5e288a92d401b968d10671c22c959 we added support to notebook rendering for matplotlib using pylabtools.select_figure_formats(shell, ["png"]). This will make display(fig) work. Ideally, this works out of the box, without having a matplotlib dependency.

Would be great if someone can figure out how.