Watch app should pause play during announcements from other apps

### Description

Other Watch-based podcast apps pause (or can be configured to pause) when another app interrupts with an announcement, for example, a fitness app milestone or a GPS app instruction. With Pocketcasts, the third-party app speaks over the podcast, making it difficult to hear both. I believe it would be a better UX to have Pocketcasts pause when another app is speaking, or at least have the option to enable that behavior.

### Screenshots or screen recording

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- [x] I have searched for existing issues.