knative: split producer and consumer

[lburgazzoli]

Fixes #521

Release Note

NONE

[lburgazzoli]

I've removed the hard dependency between the knative and the platorm-http component, however to fully take advantage of the split we need some additional work on the operator side:

• we require the platform-http capability only when we have a consumer knative endpoint (but this mean we need to add some special handling for the knative component)
• we add additional info to the catalog to list individual dependencies/capabilities required by the producer and or consumer, like:

camel-k-knative:
  groupId: org.apache.camel.k
  artifactId: camel-k-knative
  schemes:
  - id: knative
    http: true
    passive: false
  consumer:
    required-capabilities:
    - platform-http

@nicolaferraro what do you think ?

[nicolaferraro]

I've removed the hard dependency between the knative and the platorm-http component, however to fully take advantage of the split we need some additional work on the operator side:

• we require the platform-http capability only when we have a consumer knative endpoint (but this mean we need to add some special handling for the knative component)
• we add additional info to the catalog to list individual dependencies/capabilities required by the producer and or consumer, like:

camel-k-knative:
  groupId: org.apache.camel.k
  artifactId: camel-k-knative
  schemes:
  - id: knative
    http: true
    passive: false
  consumer:
    required-capabilities:
    - platform-http

@nicolaferraro what do you think ?

Sounds reasonable. I've opened: apache/camel-k#1808

[lburgazzoli]

I've added the prodcuer and consumer entries as part of the scheme

    camel-k-knative:
      groupId: org.apache.camel.k
      artifactId: camel-k-knative
      schemes:
      - id: knative
        http: true
        passive: false
        producer:
          dependencies:
          - groupId: org.apache.camel.k
            artifactId: camel-k-knative-producer
        consumer:
          dependencies:
          - groupId: org.apache.camel.k
            artifactId: camel-k-knative-consumer

At the moment, only dependencies are added but we can revisit it to include also capabilities