Summary:
Changelog: [iOS][internal] - Add twist property to PointerEvent interface
This adds the twist property to the PointerEvent implementation on iOS which similarly to tangentialPressure doesn't really apply so we default to a hard-coded value of 0.
Reviewed By: lunaleaps
Differential Revision: D37760511
fbshipit-source-id: f1fccfd6b5d07024cea83d86925a9bfc2e6cc8cf