✨ Add support for example marker

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #774

/assign vincepri

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[vincepri]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot, vincepri

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[sbueringer]

Looks like we need more PR description, again :)

[sbueringer]

/lgtm

[sbueringer]

@vincepri Merci!

And if you have some time, a release would be great :)

(but no rush, if we want to wait)

[bbkgh]

Hi. I have a question about effect of this marker/field in CRD. How can users view example for a field? kubectl explain CRD.FIELD doesn't show example section.

[sbueringer]

kubectl get crd <crd-name> -o yaml
should definitely work. Otherwise this is probably more a question for kubectl folks