feat: add custom events support#1838

fadi-george merged 6 commits intorel/5.3-betaOneSignal/react-native-onesignal:rel/5.3-betafrom

fadi/sdk-2947-add-custom-events-for-react-native-packageOneSignal/react-native-onesignal:fadi/sdk-2947-add-custom-events-for-react-native-packageCopy head branch name to clipboard