API Change detection (#1986)
* Warn when we break APIs
can be run like so `yarn diff-ts -f packages/@react-spectrum/button/**/*.d.ts -i`
* save point
* Use the docs transformer to build our API output
* update yarn lock
* couple minor updates to make it ready
* remove unused dep
* add comments and include reat-aria/stately
Co-authored-by: Danni <drobinson@livefyre.com>
