Add keda operator optional kubernetes client parameters in helm values

[egeturgay]

Use-Case

We are getting "client rate limiter Wait returned an error: context canceled" as we operate with 100+ scaler objects.
Some github issues on Keda suggest adjusting the QPS may help, unfortunately the flags are not available via the helm chart.
https://keda.sh/docs/2.12/operate/cluster/#kubernetes-client-parameters

Specification

We would like to override the default values for these flags

• kube-api-qps (default 20)
• kube-api-burst (default 30)

[egeturgay]

just realised extraArgs.keda is supported for this change, closing.