Add a showcase to customise playback settings

[MGaetan89]

Pull request

Description

This PR adds a new "Custom playback settings" showcase in the "Playlist" section. It allows the user to change the repeat mode, and toggle the pause at end of media items option.

Changes made

• Self-explanatory.

Checklist

• [x] Your branch has been rebased onto the main branch.
• [ ] APIs have been properly documented (if relevant).
• [ ] The documentation has been updated (if relevant).
• [ ] New unit tests have been written (if relevant).
• [x] The demo has been updated (if relevant).
• [x] All pull request status checks pass.

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