Add setAutoPause() method
#2411
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This PR adds a new API method to the
<perspective-viewer>custom element,setAutoPause(). When enabled withviewer.setAutoPause(true), the<perspective-viewer>will register anIntersectionObserverto test its own visibility, enabling a new internal "pause" state when offscreen. The new "pause" state deletes its internalView, freeing any resources associated with it, and doesn't recreate it until theIntersectionObserverchanges state, so while efficient for many small-data viewers, this may not yet be the right feature for a handful of large-data viewers. A future iteration which does not delete theView(but just supresses rendering) may be a future iteration of this feature.