graphic features, part 2 #85

following up from #78

todo, indexable:

• sizes - only for scatter
• cmap - it is possible to make this indexable, set a cmap for a range of the data

todo, non-indexable:

• visible doesn't trigger events yet, maybe make this a non-indexable feature EDIT Sep 2023: I am not sure if this is necessary, removing this for now.