Remove ExoPlayer.Builder from PillarboxPlayer

[StaehliJ]

Pull request

Description

The goal of this PR is to remove some complexity to the integrator by removing ExoPlayer.Builder from PillarboxPlayer.
For SRG SSR integrators we provide a DefaultPillarbox that create a PillarboxPlayer that handle SRG content and setup SRGAnalytics trackers.

Changes made

• Remove ExoPlayer.Builder from PillarboxPlayer constructor.
• Add parameters to DefaultPillarbox to match PillarboxPlayer constructor parameters.

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.