[SPIKE] Define how to support Traits into Platform CRD

In order to be able to deploy a workflow also on different environment than Kubernetes, for example on KNative, we have to add Profiles and Traits into to the Platform CRD.

As a basic use case we can consider workflow on:

• Kubernetes
• OpenShift
• KNative

These 3 different scenarios could be 3 different profiles that we will support into the Kogito Serverless Operator. 

We will than define several traits, each one supporting one or more profile, in order to let the users to customize the behavior of the final workflow.

We can use as a reference implementation what Camel K is doing with Traits

apiVersion: sw.kogito.kie.org/v1alpha08 
kind: KogitoServierlessPlatform
metadata:
  name: my-plaftorm
spec:   
  cluster: kubernetes
  platform:
    registry:
      address: quay.io/<repository>
      secret: regcred
  traits:
     deployment:
      ....
     environment:
      ...
     service:
      ...

        

Looking to the Camel K traits, we could make availble into the Kogito Serverless Operator the following:

• Ingress
• Container
• Deployment
• Environment
• Knative Service
• Knative
• Service
• Service Binding