Dispatches on the posterior's query_type to produce a suitable
figure. For "effect", "param", "energy" the plot is a
posterior-density histogram with a 95 % interval; for "map"
a three-panel mean / SD / 90 % interval-width facet; for
"sample" a quantile ribbon indexed by query position; for
"feature" a faceted density by feature; for "other" it falls
back to the "sample" layout.