[DevToolbar] Create a setting to enable highlighting React Components

I saw this page: https://bit.dev/ and, when i was looking at it anyway, they had some kind of dev mode enabled that lets to see what component is in use and link back to the docs for it on hover.

| Regular | Hover |
| --- | --- |
|  | 

We could do this for react components, using data from [annotated react components](https://www.npmjs.com/package/@sentry/webpack-plugin#reactcomponentannotation)

This type of thing dovetails with the reage&dead click highlighting, but the way to integrate the two isn't clear to me now.