Add `--json` to diff, for use from scripts / tooling#110

Draft

necaris wants to merge 5 commits intoShopify:mainfrom

necaris:feat/change-count

Commits on Dec 23, 2022

Add `changes` subcommand
Rami Chowdhury
committed

Commits on Dec 25, 2022

Back out changes subcommand
Rami Chowdhury
committed
WIP diff --json
Rami Chowdhury
committed
WIP
Rami Chowdhury
committed
Fix nominal test
Rami Chowdhury
committed