Remove flipper code from reactotron-react-native

[joshuayoes]

We currently depend on react-native-flipper https://github.com/infinitered/reactotron/blob/b6c32b6975a3df4617eabc693cf8007a5326c1b4/lib/reactotron-react-native/package.json#L53

We have a separate entry point in the package that references this https://github.com/infinitered/reactotron/blob/master/lib%2Freactotron-react-native%2Fsrc%2Fflipper-connection-manager.ts

However this code really shouldn't be in this package.

We have deprecated support for flipper, so we should remove this code to help slim down some of the package size.

[ArkanRomanPango]

any updates?