Add Video Preview Support to the Spotify Web API

[bogscam]

Developers need access to the same short video previews available in the Spotify mobile app. The current Web API only exposes audio previews (only of a small list of tracks), and this limits feature parity for apps and integrations built on top of Spotify. Adding an official endpoint for video previews would allow richer media experiences and more consistent behavior across platforms. I’m requesting that Spotify considers exposing these video assets through the Web API.