[Enhancement]: Ability to set Podcast Episode Quantity and Age Limits

[sydlexius]

Is your feature request related to a problem? Please describe.

Currently the AudioBookShelf client lacks the means to automatically archive/delete podcast episodes that exceed a certain threshold when it comes to the age or quantity of downloaded episodes.

Describe the solution you'd like

Similar to PocketCasts, it would be nice to set a threshold for the number of episodes or age of episodes to keep. This is particularly handy with certain daily podcasts, or news-oriented podcasts.

Describe alternatives you've considered

Coming from PocketCasts, here is how said feature is implemented for my feed of the BBC Global News Podcast:

Additional context

PocketCasts also has configuration options for what to do with archived episodes (ex: deletion). This isn't strictly necessary, but may be another feature worth investigating.