PodcastEpisode + MediaObject

Problem/Motivation

For a project I need the PodcastEpisode from schema.org and its associatedMedia property so I also need the MediaObject.
I can't find those schema in the module so here a proposal

Proposed resolution

Patch to add 2 modules schema_podcast_episode and schema_media_object, but also a new PropertyType "MediaObject" to be able to reference it inside the PodcastEpisode