Extract analytics from CurrentMediaItemTracker

[MGaetan89]

Pull request

Description

This PR refactors CurrentMediaItemTracker to split the logic in two pieces:

• CurrentMediaItemTagTracker which notifies when the current MediaItem's tag changes or when the current MediaItem is removed
• AnalyticsMediaItemTracker which tracks when the current MediaItem starts or stops playing, or when it is replaced by a new MediaItem

Changes made

• Split CurrentMediaItemTagTracker into two components
• Update MediaItemTrackerList so its API is more similar to a Collection
• Add new tests

Checklist

• 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).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

Code Coverage

Overall Project	55.25% -0.05%	🟢
Files changed	86.67%	🟢

Module	Coverage
:pillarbox-player	73.15% -0.16%	🟢

Files

Module	File	Coverage
:pillarbox-player	AssetLoader.kt	100%	🟢
	MediaItemTrackerList.kt	100%	🟢
	CurrentMediaItemTracker.kt	95.51%	🟢
	PillarboxPlayer.kt	68.89% -1.11%	🟢