fix: return when user navigates to the same page

[okwasniewski]

Summary

Sometimes when navigating between pages (using TabBar) view state was getting out of sync, to be specific the view.animating was being set to true when it wasn't animating. This was happening when user was pressing multiple times on the same item.

Therefore, this check was met:

if (!animated || !view.animating) {
    [view goTo:index.integerValue animated:animated];
}

Which caused pager view to be stuck on the same page. This check prevents this from happening. Reported here: react-navigation/react-navigation#10425

Test Plan

Go to TabView example and click on the same tab bar item multiple times. Check that it stops on the early return.

Compatibility

OS	Implemented
iOS	✅
Android	❌

Checklist

• I have tested this on a device and a simulator
• I added the documentation in README.md
• I updated the typed files (TS and Flow)