Upgrade CRDs to apiextensions.k8s.io/v1

[astefanutti]

Fixes #1487. Camel K CRDs currently use apiextensions.k8s.io/v1beta1, which will be removed in future release of Kubernetes: kubernetes/kubernetes#82022.

This PR enables the generation of the CRDs from the APIs, using the controller-gen CLI, which is part of the KubeBuilder project.

The Operator SDK wraps it to provide a CLI to generate CRDs. However, it does not work for Camel K APIs, as these are packaged in their own module which is not the project root module.

It will be possible to leverage the features that come with apiextensions.k8s.io/v1, such as validation and defaulting.

Last but not least, it brings OpenAPI structural schema, which also enables support for the kubectl explain sub-command for Camel K CRDs, e.g.:

$ kubectl explain integration.spec
KIND:     Integration
VERSION:  camel.apache.org/v1

RESOURCE: spec <Object>

DESCRIPTION:
     IntegrationSpec defines the desired state of Integration

FIELDS:
   configuration	<[]Object>

   dependencies	<[]string>

   flows	<[]string>

   kit	<string>

   profile	<string>
     TraitProfile represents lists of traits that are enabled for the specific
     installation/integration

   replicas	<integer>

   repositories	<[]string>

   resources	<[]Object>

   serviceAccountName	<string>

   sources	<[]Object>

   traits	<map[string]Object>

Release Note

Upgrade CRDs to apiextensions.k8s.io/v1

[astefanutti]

Currently blocked by #1550.

TODO:

• Update Helm charts
• Update OLM CSVs

[astefanutti]

Superseded by #1582.