WIP: Integrate castlab SDK

[vincentsong]

Precondition:

1. Add env vars in MultiView demo app as below

   MILLICAST_DRM_VID1_KEYID=<Your Key Id>  // must be hex string 
   MILLICAST_DRM_VID1_IV=<Your iv> // must be hex string
   MILLICAST_DRM_VID2_KEYID=<Your Key Id>  // must be hex string 
   MILLICAST_DRM_VID2_IV=<Your iv> // must be hex string

2. Use query parameter 'drm' to toggle between DRM mode in URL of multi-view demo app

To-dos:

• [x] Update workflow of fetching DRM configuration from MediaServer and backend Director API. e.g. KeyId/iv/license server URL
• [x] use media ID as video/audio element id instead of using source id
• [ ] Clean up demo apps

[changeset-bot[bot]]

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Latest commit: 0499664589bb3afeb645a771d07e61fce18f6443

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