Fixing require cycles issue

This might drop support for `firebase` package,
Personally, I think people should just opt for `react-native-firebase`

https://github.com/joltup/rn-fetch-blob/issues/183#issuecomment-450826541
https://github.com/joltup/rn-fetch-blob/pull/357
https://reactnative.dev/docs/network
https://github.com/joltup/rn-fetch-blob/pull/512
https://github.com/joltup/rn-fetch-blob/pull/688