Reconcile Custom AccessibilityInfo RNTester Examples With Upstream

We added a local RNTester page with examples for the AccessibilityInfo API. Some of these were recently added to the built-in Accessibility example page. We should contribute the rest of what we have upstream, and reconcile the duplication.

See https://github.com/facebook/react-native/commit/84dde677d90bb3cfdf53329f7d257b870cb38eca for the upstream changes that overlap ours