Spencer Ahrens dc30203734 minViewTime and waitForScroll viewability config support
Summary:
It's pretty common to want to wait until the user scrolls a view to consider any items
viewable, so `waitForScroll` enables that behavior.

It's also pretty common to want to ignore items that are quickly scrolled out of view, so we add
`minViewTime` to handle that case.

Reviewed By: bvaughn

Differential Revision: D4595659

fbshipit-source-id: 07bc8e89db63cb68d75bdd9bedde3183c38a3034
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