Integrate with crd-schema-checker

[sttts]

This issue is for awareness. @deads2k prototyped https://github.com/openshift/crd-schema-checker for the OpenShift use-case, but conversations are ongoing to promote that to an effort of Kubernetes Sig-API-Machinery. Likely, CRD schema checking would be a great addition to crossplane-lint, and integrating via vendoring would be great. Also experience from the Crossplane community would benefit crd-schema-checker.