`lib.d.ts` Updates for TypeScript 4.5

[DanielRosenwasser]

Including

• https://github.com/microsoft/TSJS-lib-generator/
• Outstanding lib.d.ts PRs to TS
• Publishing DOM types to DefinitelyTyped

[orta]

Worth noting: the Intl APIs got a big overhaul (pretty much entirely additive) which brings it up to date