Add full support for AccessibilityState prop

Summary:
Changelog:[Fabric][iOS] Add full support for AccessibilityState

Since the AccessibilityState checked, busy or expanded only exist in Android and they don't have corresponding AccessibilityTrait to set, so we could just ignore the implementation in RCTViewComponentView.mm. What I did is to update the AccessibilityState values in AccessibilityPrimitives.h and accessibilityPropsConversions.h in order to enable further implementation in Android.

Reviewed By: shergin

Differential Revision: D22807584

fbshipit-source-id: f3ef048055d11314bc833357d8ca061e0fe219a4