CODEOWNERS strategy/design for landscape-graph

cncf/landscape-graph is home to a variety of things.

* applications (both utility and end-user facing)
* daily update of landscape.cncf.io, sync'd and cleaned for import to the graph
* graphql schema definitions (source of truth)
* data model artifacts meant for both humans and robot consumption
* Sub-Graph Modules

CODEOWNERS to the rescue!

* https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
* https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features

# Tasks

- [ ] design w/ artifact (markdown in this repo) for using it for the project
- [ ] Generate task breakdown
- [ ] DoIt();