Optimizer: extend sketch-bench cardinality sweep for empirical Error beyond CMS

[milindsrivastava1997]

#526 punts non-CMS accuracy constraints on "extending sketch-bench's cardinality sweep" as separate follow-up work — no issue number was ever attached. Depends on sketch-bench#30 (cardinality sweep) landing first. Related: sketch-bench#30, sketch-bench#32.