Podchaser Integration

### What problem does this address?

Podchaser is a podcast database with extensive tools for discovery, tracking, and building playlists. Integration with PocketCasts would be helpful to streamline listening history, etc. and importing custom made playlists. For example, if a guest pops up on different podcasts, a playlist can automatically import episodes of shows I don't listen to, but want to hear because of a certain guest or topic.

### What is your proposed solution?

https://www.podchaser.com/integrations

### Did you search for existing feature suggestions?

- [X] I have searched for existing feature suggestions.

The issue names no files, tests, or entry points. Start by reviewing Podchaser's integrations page and determining the required Pocket Casts Android scope for listening-history and playlist import. Done would require an agreed integration design and clearly defined supported workflows.

Written by the indexing model from the issue text.