Adhere to iOS's `prefersCrossFadeTransitions` accessibility setting

[ssorallen]

If prefersCrossFadeTransitions is true then react-native-actions-sheet should use a cross fade transition instead of a sliding transition.

iOS has a "Prefers cross fade transitions" setting under Accessibility > Motion > Reduce Motion that swaps sliding animations for cross fade animations where applicable. iOS's native Sheet adheres to the change, which you can see in any app that uses the native sheet.