Update CRDs with schema validation and remove deprecated APIs

[yashmehrotra]

Hey, I was trying out this project and had to make some changes to remove all the deprecation warnings and get it to working on k8s version 1.20

Changes I made:

• Updated CRDs with OpenAPIV3 schema validation
• Updated CRD API
• Update RoleBindings API

I am not sure whether this project is actively being maintained or not, but if you are interested I can open a PR with the updated manifests.

[stevvooe]

I think #31 should cover you, but if you have some fixes, feel free to submit a PR.