Extract all common eslint rules to packages/eslint-config-react-native-mlkit

[trevor-coleman]

We want to have a consistent style across all of the packages in the monorepo.

The best way to do this is a shared config. A skeleton of this already exists, but to really make it work we need to extract all the rules that are dispersed throughout the monorepo and gather them in one place.

Then the individual packages can import the config and extend it if needed.