Allow to configure traits using annotations

[lburgazzoli]

Configuring traits may be a little bit complex for tooling in particular when configuring a KameletBinding where as example, to configure the service binding, one has to rescue the integration spec, like:

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: my-binding
spec:
  integration:
    traits:
      service-binding:
        configuration:
          serviceBindings:
          - postgres.org:v1alpha1:PostgreSQL

It would much more practical to have options to use annotations that re well known and we can use the json schema for the traits to let tools know what options are available for each trait so you can re-write the example above as:

apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: my-binding
  annotations:
    trait.camel.apache.org/service-binding.bindings=postgres.org:v1alpha1:PostgreSQL

/cc @nicolaferraro @astefanutti what do you think ?

[astefanutti]

That's a good idea.

My understanding is that the traits.yaml schema file contains the CLI properties, rather than the JSON properties, as it's used by tooling for modeline IIRC.

I don't think we have a proper JSON schema for traits yet, see #1614.

[lburgazzoli]

I don't think we have a proper JSON schema for traits yet, see #1614.

A ok, I thought it was already there but it is not a big issue IMHO and we can introduce support later on.

[astefanutti]

I agree. That'll motivate me to work back on #1624 😅.