Merge and align global.d.ts and globals.d.ts files (#49516)

Summary:
Pull Request resolved: #49516

Merge global.d.ts and globals.d.ts into one file and align some definitions with implementations.

Changelog:
[General][Changed] - Improve TypeScript types for `global` objects

Reviewed By: huntie

Differential Revision: D69772463

Author: coado

packages/react-native/index.js.flow

@@ -21,6 +21,8 @@ export type {HostInstance} from './src/private/types/HostInstance';
 export type {HostComponent} from './src/private/types/HostComponent';
 export {default as registerCallableModule} from './Libraries/Core/registerCallableModule';
 
+/// <reference path="src/types/globals.d.ts" />
+
 // #region Components
 
 export {default as AccessibilityInfo} from './Libraries/Components/AccessibilityInfo/AccessibilityInfo';