DRAFT: New deployment controller

[RomanBednar]

• PR has commits for library-go for the sake of testing and review
• some commits are meant to be dropped and are here just for demonstration purposes
• needs better naming

Related bug: https://issues.redhat.com/browse/OCPBUGS-24588

ClusterCSIDriver condition when precondition fails:

  - lastTransitionTime: "2024-07-24T11:13:45Z"
    message: |
      dummy precondition 3 failed
    reason: PreconditionNotFulfilled
    status: "True"
    type: DeploymentDegraded

Controllers can be configured with csi-operator to have multiple preconditions, errors are then aggregated in ClusterCSIDriver:

- lastTransitionTime: "2024-07-24T11:13:45Z"
    message: |
      dummy error 2
      dummy error 3
    reason: PreconditionNotFulfilled
    status: "True"
    type: DeploymentDegraded

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[RomanBednar]

I'm not really sure if this meets the goal of writing new controller with DeploymentController API - ideally the API of the new controller should match the current deployment controller (so for callers the change is transparent) but I was not sure how that could be done since the signature of workload controller constructor is different.