Add makefile entries for api-lint

[rikatz]

This PR adds the makefile entries for Kube api linter, as discussed during WG Inference meeting.

The linter now can be called locally using make verify or make api-lint.

A lint-fix wasn't added, as it is expected that the fixes are discussed and not automatically fixed.

Fixes: #1380

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rikatz
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[rikatz]

/hold

I will submit a broken change just to guarantee KAL is running

[rikatz]

Bad run output: https://github.com/kubernetes-sigs/gateway-api-inference-extension/actions/runs/16977153553/job/48128874167?pr=1384

And on prow:
https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_gateway-api-inference-extension/1384/pull-gateway-api-inference-extension-verify-main/1956106235279314944

[rikatz]

/hold cancel

[BenTheElder]

Maybe make the CI use this so you know local and CI invocations are in sync?

[rikatz]

Maybe make the CI use this so you know local and CI invocations are in sync?

hey Ben, the verify-main prow job uses it, but good catch. I will change the github action one to use make api-lint instead.