✨ pkg/crd: support validating internal list items on list types

[AlexanderYastrebov]

For #342

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @AlexanderYastrebov. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[AlexanderYastrebov]

Reopened #898 and pushed changes there as requested #898 (comment)