Allow client-side rate-limiting to be disabled

[wallrj]

In cert-manager/website#1458 I attempted to disable client-side rate-limiting of API requests,
by setting kubernetesAPIQPS: -1 in the controller config.
It should be possible, but -1 was rejected by the config validation function.

config:
  apiVersion: controller.config.cert-manager.io/v1alpha1
  kind: ControllerConfiguration
  kubernetesAPIQPS: -1
  kubernetesAPIBurst: -1

kubectl logs -n cert-manager cert-manager-f4948ff9-6sfm2

E0409 13:34:03.843673 1 main.go:39] "error executing command" err="error validating flags: [invalid value for kube-api-burst: -1 must be higher than 0, invalid value for kube-api-qps: -1 must be higher than 0]" logger="cert-manager"

FluxCD have implemented a mechanism to detect whether API Fairness and Queuing is enabled by the API server,
and disable the client-side rate-limiting in that case:

• runtime: Use server-side throttling fluxcd/pkg#269
• https://github.com/kubernetes/kubernetes/blob/6813625b7cd706db5bc7388921be03071e1a492d/staging/src/k8s.io/client-go/rest/config.go#L351-L364

Kubernetes client-go are also considering ways to disable the client-side rate limiter when server-side rate limiting is enabled:

• Disable client-side rate-limiting when AP&F is enabled kubernetes/kubernetes#111880

/kind feature