Summary:
## Context
The editor for mocks is currently just a textarea. It'd be nicer as a monaco editor :D
## Changes
* Add monaco editor
* Change bundler for flipper plugins to allow loading .ttf as `dataurl`
* Resize the input/button for name and save and put them at the top next to each other
* Add a default mock template for when the editor is empty
allow-large-files
Reviewed By: aigoncharov
Differential Revision: D45929635
fbshipit-source-id: 66f3103d073ac630cb41d21f2ce3a7f89e15fed8
0d34662698