Support for WSO2 APIM v4.0.0

[bmonteiro]

Hi guys, Do you have any plans to update this operator to support the new version v4.0.0 ?

@BLasan @keshiha96 @pubudu538

[karezza]

I've located these, maybe this is the method going forward:
https://hub.kubeapps.com/charts/wso2