Add models for QoS and an AnalyticsListener to gather session load times

[MGaetan89]

Pull request

Description

This PR adds the models needed for QoS (session, event, error, message). It also adds a custom AnalyticsListener to measure the load times of a media, and report them in the QoS session.

Changes made

• Add QoS specific models.
• Add a new AnalyticsListener on PillarboxExoPlayer to observe media load times.
• Include the library version in the BuildConfig.VERSION_NAME field.
• Add some unit 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	52.37% -0.54%	🟢
Files changed	85.73%	🟢

Module	Coverage
:pillarbox-player	53.3% -1.09%	🟢

Files

Module	File	Coverage
:pillarbox-player	QoSSessionTimings.kt	100%	🟢
	QoSSession.kt	100%	🟢
	QoSError.kt	96.92% -3.08%	🟢
	QoSSessionAnalyticsListener.kt	91.09% -8.91%	🟢
	PillarboxMediaSource.kt	87.47% -6.59%	🟢
	PillarboxExoPlayer.kt	83.37%	🟢
	PillarboxMediaSourceFactory.kt	54.6%	🟢
	QoSEvent.kt	0%	🟢
	QoSMessage.kt	0%	🟢