Move react-native packages to their own monorepo

[shilman]

We should move react-native and its affiliated packages to its own monorepo: https://github.com/storybookjs/react-native

Why

We want to be able to release and version RN independently of the rest of Storybook:

• Changes in Storybook core force changes in react-native even when RN is not ready
• Changes in RN force breaking changes in @storybook/react-native but we are unable to make those changes due to semver

What

• Create a lerna monorepo in https://github.com/storybookjs/react-native @gabrielcsapo @Gongreg
• Move app/react-native, app/react-native-server, and app/examples-native to the monorepo @Gongreg
• Set up linting from https://github.com/storybookjs/eslint-config-storybook
• Set up CI on circle CI @Gongreg @ndelangen
• Update documentation @Gongreg @ndelangen
• Set up CHANGELOG and release process Release process for Storybook poly-repos storybook#8901

[Gongreg]

One of the main benefits we will get by moving out, is that we will be able to lock in the dependencies for React Native Storybook and focus on stability.

This way the developer/user experience to work with/on Storybook will be a lot better.

If you have any suggestions/ideas feel free to share them :)

[stale]

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