React Native Support

[chasefleming]

trafficstars

Issue to be solved

There are currently a few issues blocking FCL from working in React Native. Would be nice to get the issues resolved so that people can build mobile apps with React.

### Tasks
- [ ] https://github.com/onflow/fcl-js/issues/1592
- [ ] https://github.com/onflow/fcl-js/issues/1593
- [ ] https://github.com/onflow/fcl-js/issues/1612

[justinbarry]

Begun here: https://github.com/onflow/fcl-js/tree/fcl-react-native