implement requiresMainQueueSetup for RN > 0.49 
implement requiresMainQueueSetup for RN > 0.49 

RN 0.49 show warning 
```
Module RCTOneSignalEventEmitter requires main queue setup since it overrides `constantsToExport` but doesn't implement `requiresMainQueueSetup`. In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of.
```
this implementation fix warning for future proof.
geektimecoil/react-native-onesignal,geektimecoil/react-native-onesignal,geektimecoil/react-native-onesignal