Summary:
- Add MockResponseDetail component to show and edit mocked route
- Add `immer` package which will be used for internal state handler
Change from PR
- Change to functional component
Note:
- This is a part of this PR: https://github.com/facebook/flipper/pull/488
Reviewed By: mweststrate
Differential Revision: D20440149
fbshipit-source-id: d7c35600b9a22cb62c2bdae7e19abe5c767e3670
