Create PolicyRevision and ClusterPolicyRevision CRDs

[fabriziosestito]

Description

Create PolicyRevision and ClusterPolicyRevision CRDs to store policy state and enable tracking of policy versions.

References

• https://github.com/kubewarden/rfc/blob/main/rfc/0022-policy-lifecycle.md#policyrevision-crd
• https://github.com/kubewarden/rfc/blob/main/rfc/0022-policy-lifecycle.md#policy-status
• https://github.com/kubewarden/rfc/blob/main/rfc/0022-policy-lifecycle.md#use-distinct-policyrevision-crds-for-cluster-wide-and-namespaced-policies

Acceptance Criteria:

• Create the PolicyRevision CRD and ClusterPolicyRevision with fields for policy content, enabled status, and policyGeneration.
• Implement status conditions: Scheduled, Initialized, and Ready
• Add the policy phase field (Pending, Updating, Active, Failed)
• Ensure (Cluster) PolicyRevision includes replica identification for status reporting
• Add proper labeling for filtering by Policy Server instance