valid openAPIV3 Schema

[cyberox]

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What would you like to be added: Update the ENIConfig CRD to include a valid openAPIV3 Schema

Why is this needed: When creating ENIConfig resources using Terraform manifest resources, I receive a warning:

│ Warning: This custom resource does not have an associated OpenAPI schema.
│
│ We could not find an OpenAPI schema for this custom resource. Updates to this resource will cause a forced replacement.

Terraform issue: https://github.com/hashicorp/terraform-provider-kubernetes/issues/1382