Automatically handle dataframe inputs for creating graphics #395

Very early idea, inspired by @gviejo 😄 and #394

Seaborn allows creating plots using dataframes. We could offer a similar high-level API (even higher level than fastplotlib already is) where dataframes are used as inputs, and the columns for the actual data to plot are specified (xs, ys, zs, etc.), and it automatically creates labels, legends etc. based on this.

Early thoughts:

1. Do we want to do this?
2. Does this belong in the Graphics API? I am kind of leaning towards it belonging in a higher level API - something between Graphics and widgets. @clewis7 your thoughts would be great here!
3. Another reason why I think it belongs in a higher level API than Graphics is because we could offer things like kde plots which would be comprised of multiple graphics, and the graphics could be switchable (ScatterGraphic vs. HeatmapGraphic to represent the KDE).
4. If we do this,