Include DevTools as Public API

The idea is to have a multi-version extension that allow you to attach a "debugger" to a running React instance. This debugger protocol injects intercepted functions into a particular version of React which exposes development hooks. Effectively this: https://github.com/facebook/react-devtools/tree/devtools-next/backend/integration This is not intended to expose stateful reflection APIs in production use since it will negatively affect performance.