Description

This PR adds support for setting the playback speed to a PillarboxCastPlayer.

Changes made

• Add support for setting the playback parameters in PillarboxCastPlayer, in particular to handle playback speed (the pitch value is ignored).
• Add support for setting the playlist metadata in PillarboxCastPlayer (see the corresponding Media3 PR).
• Remove the Pull request title from the Pull Request template, since its redundant.

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).