Traits configuration schema

[astefanutti]

The traits configuration is stored in the Integration, IntegrationKit and IntegrationPlatform resources. While this makes trait configuration part of the Camel K public API, it is not defined in any schema, and is loosely validated.

Following #1600, the traits structs are used directly for serialisation. Instead of declaring map[string]TraitSpec fields in the API, we could make the traits structs part of the Camel K API, and refer to them from the Integration, IntegrationKit and IntegrationPlatform types.

With #1582, the traits configuration schema will automatically be generated and included in the CRDs structural schemas.

[github-actions]

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[tadayosi]

Done with #3235