[Enhancement]: Support media:content in addition to enclosure.url for podcast episodes

[Timtam]

Type of Enhancement

Server Backend

Describe the Feature/Enhancement

Some podcasts do provide URLs to their content not within the enclosure -> url attribute, but within a media:content attribute. Audiobookshelf currently only checks for enclosure.url and thus ignores episodes with an url within a media:content attribute. I think this format is known as Mrss, I don't know for sure though. That seems to be the main way of exporting podcasts from rss-bridge https://github.com/RSS-Bridge/rss-bridge.
An example podcast can be found here: https://rss.nixnet.services/?action=display&bridge=ARDAudiothekBridge&path=https%3A%2F%2Fwww.ardaudiothek.de%2Fsendung%2Fkalk-welk%2F10777871%2F&limit=&format=Mrss

Why would this be helpful?

Rss Bridge is a pretty useful tool, and most likely not the only one using Mrss. It'd be great to be able to use rss bridge together with ABS.

Future Implementation (Screenshot)

Just a backend change, no visual change required.

Audiobookshelf Server Version

v2.17.5

Current Implementation (Screenshot)

No response