Feature Request: Favorites option

### Impacted plugin

VideoPress

### What

Add a Favorites option to the player

### How

Hello,

Would it be possible to add a "favorites" option to the VideoPress player, so that the users can create their own list with videos they're currently working on ?

Thanks !

Start by locating the VideoPress player implementation and reviewing how its users and videos are currently handled. Clarify the intended favorites workflow and scope with maintainers; done should provide a usable Favorites option that lets users create and access a list of videos they are working on.

Written by the indexing model from the issue text.