Graphviz

[KevinMind]

• more up to date
• supports openapi spec v3
• supports doc string parsing and more explicit customizations

Fixes: mozilla/addons#ISSUENUM

Description

Context

Testing

Checklist

• [ ] Add #ISSUENUM at the top of your PR to an existing open issue in the mozilla/addons repository.
• [ ] Successfully verified the change locally.
• [ ] The change is covered by automated tests, or otherwise indicated why doing so is unnecessary/impossible.
• [ ] Add before and after screenshots (Only for changes that impact the UI).
• [ ] Add or update relevant docs reflecting the changes made.