Add warning for when people use drawer navigator inside tab navigator

[brentvatne]

This doesn't work on Android currently and nobody is working on fixing that at the moment, so we should warn. #4154

[daviscabral]

@brentvatne would you consider accept a PR that fixes that? Just checking before considering workarounds in other libs that consumes react-navigation.

[brentvatne]

in https://github.com/react-navigation/react-navigation-drawer/tree/next i switched to using drawerlayout from react-native-gesture-handler, and that should resolve the issue, but I haven't verified that yet

[brentvatne]

i believe it's fixed but created an issue to verify it here: https://github.com/react-navigation/react-navigation-drawer/issues/21