[playlist-plugin] Add "Repeat One" mode

[jboix]

Description

As an integrator, I want to enhance the playlist plugin to include a "repeat one" mode, allowing for a single item in the playlist to be looped continuously. This feature aligns the API with the behaviour found in Apple and Android libraries.

Acceptance Criteria

• Implement a "repeat one" mode in the playlist plugin. When activated, the currently playing item should loop continuously until the mode is deactivated.
• The mode should be configurable and easily switchable between repeat one, repeat all, and no repeat states.

[github-actions]

🎉 This issue has been resolved in version @srgssr/pillarbox-playlist-v2.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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