optimizely / javascript-sdk / 2873

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feat: Added React Native Client Engines to be sent in events (#696)

## Summary
Added Two new client engine values to be sent in events.

**react-native-sdk**: Client name will be set to `react-native-sdk` when a react native application will use react sdk i.e `@optimizely/react-sdk`.

**react-native-js-sdk**: Client name will be set to `react-native-js-sdk` when a react native application will use javascript sdk directly i.e `@optimizely/optimizely-sdk`.

### Client Versions
Client versions behave the way they did 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-sdk` 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-sdk` goes with `clientVersion` of react SDK. 

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

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