iOS: Introduce vision interfaceIdiom (facebook#42243)

Summary:
This PR introduces the `vision` interfaceIdiom to check if the app runs on visionOS.

An update to the documentation should follow this change.

[IOS] [ADDED] - Introduce `vision` interfaceIdiom

Pull Request resolved: facebook#42243

Test Plan: This change has been used in `react-native-visionos` and the interfaceIdiom changes **only** when running in the non-compatibility mode. But it's still useful to have this upstream if at some point React native would compile to visionOS natively

Reviewed By: cortinico

Differential Revision: D52730028

Pulled By: cipolleschi

fbshipit-source-id: 711c5c2c6c7fe05b3ff8da7383b5e63e9e04acfa

Author: okwasniewski

packages/react-native/Libraries/Utilities/Platform.d.ts

@@ -54,6 +54,8 @@ interface PlatformIOSStatic extends PlatformStatic {
   OS: 'ios';
   isPad: boolean;
   isTV: boolean;
+  isVision: boolean;
+  isMacCatalyst?: boolean | undefined;
   Version: string;
 }
 

packages/react-native/Libraries/Utilities/Platform.flow.js

@@ -41,6 +41,8 @@ type IOSPlatform = {
   // $FlowFixMe[unsafe-getters-setters]
   get isTV(): boolean,
   // $FlowFixMe[unsafe-getters-setters]
+  get isVision(): boolean,
+  // $FlowFixMe[unsafe-getters-setters]
   get isTesting(): boolean,
   // $FlowFixMe[unsafe-getters-setters]
   get isDisableAnimations(): boolean,

packages/react-native/Libraries/Utilities/Platform.ios.js

@@ -57,6 +57,11 @@ const Platform: PlatformType = {
     return this.constants.interfaceIdiom === 'tv';
   },
   // $FlowFixMe[unsafe-getters-setters]
+  get isVision(): boolean {
+    // $FlowFixMe[object-this-reference]
+    return this.constants.interfaceIdiom === 'vision';
+  },
+  // $FlowFixMe[unsafe-getters-setters]
   get isTesting(): boolean {
     if (__DEV__) {
       // $FlowFixMe[object-this-reference]