[Epic] Status Subsystem

[lgadban]

kgateway policies currently do not have status.
We need to implement k8s native (and possibly Kube GW API native[1]) statuses for these resources
This status system should be KRT-centric

Additionally we need to audit the status mechanism for standard Kube GW API resources

• remove reliance on ctrl-runtime manager client for persisting k8s gw status
  • currently in proxy_syncer.go, syncGatewayStatus and syncRouteStatus

.1. check state of the art w.r.t policy status

See Also

I think we do a pretty good job of handling status in Istio for the ambient controllers. It's queued and outside the hot path of KRT. Here are some PRs for reference/inspiration

• initial impl of the status writer: https://github.com/istio/istio/pull/51945/files
• leader election for the status writer: https://github.com/istio/istio/pull/53296/files
• impl a status for a type based on the status writer: https://github.com/istio/istio/pull/52929/files