Make sure generated Gateway-API object fields obey kubebuilder max item validation

[levikobi]

What would you like to be added:
Add a mechanism that considers the kube-builder max item validation on Gateway-API list fields. See this for example.

One option is to validate the constraint, and if it is exceeded - throw an appropriate message.
Another option is to add conversion logic that splits objects by these constraints, which will be more challenging.

Why this is needed:
To help migrating users who violate those constraints. See kubernetes-sigs/gateway-api#2501 as an example.

[levikobi]

/help

[k8s-ci-robot]

@levikobi:
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[swastik959]

hi , I am interested in this issue
/assign