Add `wp.media.view.MediaFrame.MediaDetails`, which `wp.media.view.MediaFrame.AudioDetails` and `media.view.MediaFrame.VideoDetails` extend. The subclasses subsequently only need to set `createStates()` and `bindHandlers()`, as well as any missing toolbar views.

See #27016.



git-svn-id: https://develop.svn.wordpress.org/trunk@27479 602fd350-edb4-49c9-b593-d223f7449a82