Make integrations addressable (Knative SinkBinding)

[nicolaferraro]

Knative users can send events to "Addressable" objects via sink binding. A KNative Service is addressable, because it specifies a URL in a specific position in the status. We can make also the integration addressable (by reporting the underlying Kservice URL in the main resource).

This way, knative users can address integrations directly.

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[squakez]

@claudio4j @christophd do you think this still make sense?

[claudio4j]

Sure, setting the integration as a knative addressable resource adds more opportunity to knative users to add camel-k integrations as destinations of SinkBindings. However the target integration must be aware of the CloudEvents spec as it is going to be the message protocol.