Hi, I saw you were open to PRs to implement the editor. Since I'm gonna need it in my project I thought I might take a stab at it.

So far I've added the add/delete/edit icons and what's needed to make the fields editable, but I haven't really touched the state management.
Before doing that I wanted to ask if you'd prefer to keep the v1 "style", where onEdit notifies a single change with a list of "namespace" keys, or if we could turn it into a more standard controlled react component where onEdit gives the whole updated json object. I'd prefer the latter since as a user having to update the object manually means a good amount of tedious boilerplate.