[FEATURE REQ] callAgent.addOnConnectionStateChangedListener()

[JasonWeinzierl]

Is your feature request related to a problem? Please describe.

If the call agent is no longer connected to Azure, there's currently no event in the Android calling SDK. This means we have no idea if the call agent needs to be disposed and re-created. Please add an event to inform us of when the call agent disconnects.

Describe the solution you'd like

callAgent.addOnConnectionStateChangedListener {
  Log.i(TAG, "Connection state of call agent changed from ${it.oldValue} to ${it.newValue} with reason ${it.reason}")
}

Describe alternatives you've considered

Restart the call agent periodically, in case it silently disconnected.

Additional context

The latest beta 1.15.1-beta.1 for the JS calling SDK added callAgent.on('connectionStateChanged');. Is this planned for the Android SDK as well?

Information Checklist

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• [x] Description Added
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