Add isolatedDeclarations to common, true-time and player.

[enjikaka]

• 📖 tl;dr: TypeScript's new isolated declaration feature is a game changer for sharing code among developers. It significantly simplifies the process of packaging your code for consumption whilst reducing the time to create type definition files from minutes, sometimes even hours, down to less than a second.
  https://marvinh.dev/blog/speeding-up-javascript-ecosystem-part-10/

• you don't need to create *.d.ts files manually anymore by invoking the tsc compiler.

We still need vite dts plugin for NPM; so need to wait for that plugin to not fail on latest TS config.

[osmestad]

is this change correct?

[enjikaka]

Yeah isolated declarations require separate defs for track and video.