feat: [Performance] Allow to pass a selector to the useWindowDimensions hook to avoid unnecessary re-renders

[retyui]

Summary:

Performance issue was shown on App.js 2026 Conf: https://www.youtube.com/live/4H8iRPN0Q2M?si=pykgDXJcbvi7_OIC&t=8704 by @jmeistrich

// but now with this PR devs can pass a selector 
// to subscribe to `fontScale` changes only 
const fontScale = useWindowDimensions(state => state.fontScale)

Changelog:

[GENERAL] [ADDED] - Allow to pass a selector to useWindowDimensions(state => state.fontScale) to avoid unnecessary re-renders

Test Plan:

I did my best to cover all testcases:

yarn test packages/react-native/Libraries/Utilities/__tests__/useWindowDimensions-test.js

[github-actions]

Warning

JavaScript API change detected

This PR commits an update to ReactNativeApi.d.ts, indicating a change to React Native's public JavaScript API.

• Please include a clear changelog message.
• This change will be subject to additional review.

This change was flagged as: POTENTIALLY_BREAKING