Nest params in data, making it consistent with the ios counterpart

Author: MartinElvar

android/src/main/java/io/wazo/callkeep/RNCallKeepModule.java

@@ -893,11 +893,14 @@ private void sendEventToJS(String eventName, @Nullable WritableMap params) {
         if (isBoundToJS && hasListeners) {
             this.reactContext.getJSModule(RCTDeviceEventEmitter.class).emit(eventName, params);
         } else {
+            WritableMap data = Arguments.createMap();
             if (params == null) {
                 params = Arguments.createMap();
             }
-            params.putString("name", eventName);
-            delayedEvents.pushMap(params);
+
+            data.putString("name", eventName);
+            data.putMap("data", params);
+            delayedEvents.pushMap(data);
         }
     }