Manual gate control by api in loadtester

[PalanQu]

Describe the feature

Manual approve each step of canary phase by send http request, for the current time, the loadtester accept the canary name and namespace as key, maybe we should add CanaryPhase in this key and auto remove the previous step key

canaryName := fmt.Sprintf("%s.%s", canary.Name, canary.Namespace)
approved := gate.isOpen(canaryName)

Proposed solution

Any alternatives you've considered?

Is there another way to solve this problem that isn't as good a solution?

[PalanQu]

If accept this solution, I will create a PR for this

[teochenglim]

I have proposed another way #1344
@PalanQu please take a look and see if we can do together?