Allow validating external APIs (CRDs)

[ibotty]

It would be great to be able to add additional schemas to validate against.

I propose to also include schemas in a user-local and global directory.

What do you think of that feature?

[willthames]

I definitely like the idea - not sure how easy it is to do but I would benefit from it too

[paketb0te]

This would be a really neat feature :)

[fliphess-tiqets]

I would love to have this feature! :)

What might be an option is to use the schema's from https://github.com/datreeio/CRDs-catalog