RNCallKeep is not working on app background and Inactive States

Bug report

• I've checked the(https://github.com/react-native-webrtc/react-native-callkeep/tree/master/example) to reproduce the issue.

Description

I have implemented RNCallKeep features in such a way that when a push notification arrives, then it tries to display an incoming UI through RNCallKeepDisplayIncomingUI(). When the app is in foreground as per the logic If I click on answer button, it is redirecting to a specific page; howsoever, the functionality that I am mentioning wasn't working as expected when the app goes to background or inactive state.

In background state, on click of answer button, the expected behaviour is that app should change its state to foreground, open the app automatically and redirect to the specific screen. The navigation logic is working fine but it is not opening the app and behave according to the logic.

Help will be appreciated.

Versions

- Callkeep: 3.0.12
- React Native: 0.59.9
- iOS: 10.15.2
- Android: android 9.0
- Phone model: Nokia 5.1 plus 

Start with the example referenced in the issue and trace the RNCallKeepDisplayIncomingUI() answer flow in foreground, background, and inactive states. Compare the app-state and navigation behavior when an incoming call is answered. Done means answering from background or inactive state brings the app to the foreground and opens the intended screen, as it already does in foreground.