CairoMakie does not respect the z translation of plots inside recipes

[asinghvi17]

Encountered this recently in a custom recipe (basically a choropleth which shows all admin levels (states, regions, districts) of a specific country. This is because we don't fully flatten plots in CairoMakie, instead relying on recipe level implementations. Thus, any z-level adjustment that is not at the level of the plot which sits in scene.plots will not be applied.

The solution to this is to change how get_all_plots behaves, such that it fully flattens all plots to the atomic level. Then, it could be overridden by multiple dispatch for certain plot types, like band or poly, which we want to be able to plot directly.

These recipe overrides would also have to detect whether their components had the same transformation matrices, and figure out how to handle them if they do not.