Be able to filter by title for smart playlists

### Description

I would like the smart play lists to have the ability to create lists based on keyword in title. For example I would have an all 'Bonus' episode list. Or follow a particular interviewee across all of my podcasts.

### Screenshots or screen recording

### Did you search for existing list?

- [x] I have searched for existing issues.

The issue names no files, tests, or entry points. Start by locating the smart playlist filtering flow in the iOS app and compare the requested title keyword examples with its existing criteria. Done means smart playlists can match keywords in episode titles, including bonus episodes and interviewees, with coverage for the resulting behavior.

Written by the indexing model from the issue text.