## Description
This PR introduces the concept of "experimental" settings or features.
These may cause instabilities or may need further testing. They may be
changed or removed any time. Also, the developers won't provide lots of
support for them.
The goal is expose some specialized settings that might only apply to a
small subset of users or test out tweaks to playback.
The first experimental feature is a toggle to enable [video
tunneling](https://developer.android.com/media/media3/exoplayer/track-selection#tunneling).
### Related issues
Related to #1283
### Testing
Emulator
## Screenshots
N/A
## AI or LLM usage
None
