New Preview Url Service Public API

Version 2007.1 introduced the content based multi preview configuration for Studio. Starting with 2007.2 the underlying implementation is available as a public API. Currently, the API is only used by Studio but the API is not limited to the usage in Studio. The API is available as a dependency and offers the possibility to develop custom so called PreviewProviders to be used in Studio or e.g. to implement a specialized external preview URL service as a standalone (micro-)service.

(CMS-17262)