feat: introduce fullfill or fail based on server result for callkit

[santhoshvai]

💡 Overview

According to callkit spec

1. we need to fulfill or fail based on server result for accept and endcall if there is no websocket established yet
2. If websocket was established we must immediately fulfill or fail accordingly

• This avoids other calls to interfere while joining or ending happens (which can technically but rarely happen)
• Importantly - Fixes the issue of quick decline not working due to JS bridge not loading at all - link to the issue in callkeep

Apple docs excerpt below

https://developer.apple.com/documentation/PushKit/responding-to-voip-notifications-from-pushkit

• If the recipient of a call answers before the app establishes a connection to your server, don’t fulfill the CXAnswerCallAction object sent to the provider(_:perform:) method of your delegate immediately. Instead, wait until you establish a connection and then fulfill the object. While it waits for your app to fulfill the request, the incoming call interface lets the user know that the call is connecting, but not yet ready.

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Latest commit: 4aaaae6

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