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feat: Added React Native Client Engines to be sent in events (#435)

## Summary
Added Two new client engine values to be sent in events.
#### react-native-js
Client Engine will be set to `react-native-js` when a react native application will use javascript sdk directly
#### react-native
Client Engine will be set to `react-native` when a react native application will use react sdk 
#### Client Versions
Client versions behave correctly without any change. Current behaviour is.
1. When a react native app uses javascript SDK directly, clientVersion will be the version of javascript SDK. Which means `react-native-js` goes with `clientVersion` of javascript SDK
2. When a react native app uses React SDK, clientVersion will be the version passed in by react SDK. This means `react-native` goes with `clientVersion` of react SDK. 

## Test plan
Made appropriate changes to already existing unit tests.

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