use duck test for marks #967
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This allows different versions of Plot to be composed, e.g.: https://observablehq.com/d/2f8e482dc7cc105f
The duck test for Mark here is limited: it only tests for a render method, but it will crash downstream if the filter or initialize methods are not defined. We could test for those, too, or provide default implementations, but I figure this is fine for now.