feat(kuma-cp): add possibility to configure kubernetes client qps and…

[Automaat]

… burst qps

Checklist prior to review

• Link to relevant issue as well as docs and UI issues --
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? --
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests?

[Automaat]

This pr solves the performance issue with slow creation of new dataplane on k8s with bigger deployments (600+ dpp). On deployment this size we make at most 80 qps, so default of 100 gives some headroom. This should be increased for bigger deployment, I will add docs describing this.

[lahabana]

Is there some monitoring we can add to make it obvious when this parameter needs to be bumped?

[michaelbeaumont]

👍

[johnharris85]

LGTM