[CRD] Add KVCachePool API and runtime connector specs

[YouNeedCryDear]

What this PR does

• Adds the namespace-scoped KVCachePool API for provider-neutral KV cache pool configuration.
• Adds InferenceService.spec.kvCachePool as a reference-only binding to an existing pool.
• Adds ServingRuntime.spec.kvCacheConnectors for runtime-side KV cache connector metadata.
• Adds generated API helpers for deepcopy, defaulting, clientset, informers, and listers.
• Updates OEP-0010 to align the design with the implemented alpha API shape.

Why we need it

OME needs a first-class API for independently managed KV cache pools so serving endpoints can attach to compatible pool implementations without treating KV cache infrastructure as an InferenceService-owned component. Runtime connector metadata lets the selected runtime describe how engine, decoder, router, or predictor components should connect to a referenced pool.

Fixes #

How to test

Not run by Codex while creating this PR; the branch and commits were already pushed.

Checklist

• Tests added/updated (if applicable)
• Docs updated (if applicable)
• make test passes locally