ExtendableHeatmap's outline_domains() draws over add_rectangles()

this happens even if outline_domains() is called first

this is because of the default zorder of patches vs lines:

https://matplotlib.org/3.1.1/gallery/misc/zorder_demo.html

one solution is to expose a zorder kwarg on add_rectangles() to allow clients to order this patch-based visualization versus the line-based visualizations

one thing we can look into is what other plot elements are affected by this issue; the intended/expected behavior here is that if a plot element is added later it should appear on top of the plot elements that were added earlier

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