Summary:
- Support loading globally installed DevTools
Background:
1. Initially, I wanted to use react-devtools-core as before. react-devtools-core standalone contains quite a few imports of node.js APIs. After [a conversation with Brian](https://fb.workplace.com/groups/react.devtools/permalink/3131548550392044), I pivoted to react-devtools-inline
2. Technical design doc of react-devtools-inline integration: https://docs.google.com/document/d/1STUSUhXzrW_KkvqSu7Ge-rxjVFF7oU3_NbwzimkO_Z4
3. We support usage of globally installed devtools. Code of react-devtools-inline is not ready to be used by the browser as is. We need to bundle it and substitute React and ReactDOM imports with the globals.
4. As we can't pre-compile what users install globally, we need to bundle global devtools on demand,
5. I tried re-using our Metro bundling pipeline initially, but gave up after fighting it for 2 days. Included, `rollup` instead.
6. Size of a `tgz` archive with a plugin is 2.1MB
allow-large-files
Reviewed By: mweststrate
Differential Revision: D34968770
fbshipit-source-id: 352299964ccc195b8677dbda47db84ffaf38737b
