Sketch: Implement VoIP Notifications for Live Kit Calls

[tomastiminskas]

Requirements:

• Start registering VoIP device ID on server: new binding needed similar to setPushToken with 'VoIPpushToken' and 'pushKey' to encrypt call data so user can join call
• Start including a non encrypted param on messages of type call so server knows it needs to send a VoIP push instead of a standard push
• Encrypted message content should be included in VoIP so it can be decrypted on didReceived method and use it to join the call

@Evanfeenstra let me know your thoughts about this. Maybe I'm missing something