iOS CallKit and PushKit integration for Calls

Making this thread for tracking CallKit and PushKit integration progress and updates.
Currently CometChatPro is using a legacy VoIP integration in iOS and integrating CallKit and PushKit will handle and solve a lot of use cases in regards to voice and video calls.

As discussed before in Slack, CometChat already has CallKit and PushKit integration in their roadmap.

https://cometchat.slack.com/archives/CKXTN3L10/p1568618287000600

Hi @jeraldo,

Yes, the CallKit functionality is in our road map however at present I cannot provide you the release date of the same.