Add kubebuilder annotations and fix model descriptions

[spolti]

Fixes #158

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[spolti]

@ricardozanini it is ready for review.
Added somo TODOs where it needs to have some exclusive validation according to the spec.

[ricardozanini]

A few comments only! I think we need to have a way to verify if these annotations are generating the right OpenAPI and validate it in the Kubernetes API to test if it's accepted.

[spolti]

A few comments only! I think we need to have a way to verify if these annotations are generating the right OpenAPI and validate it in the Kubernetes API to test if it's accepted.

indeed, we can try to use kubectl or something else.

Issue created: #161

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[ricardozanini]

Cool! Let's gooo