fix(setup-audio-tracks): undefined property kind in dashTrack

[amtins]

Description

This PR fixes the use of the kind property which is undefined in the dashTrack object causing all audio tracks to have kind set to main.

Specific Changes proposed

• adds a function to determine the kind according to the property roles and accessibility from the object dashTrack provided by dash.js.

Note

This PR does not strictly follow the specification see ref-for-audio-adaptation-set:

Clients SHALL consider there to be an implicit Role descriptor with the "Role" scheme and the value main if no explicitly defined Role descriptor with the "Role" scheme is present.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
• Reviewed by Two Core Contributors