feat(ws): initial commit for controller

[jiridanek]

cd workspaces/controller
go mod init github.com/kubeflow/notebooks/workspaces/controller
kubebuilder init \
    --plugins=go/v4 \
    --domain=kubeflow.org \
    --project-name=workspace-controller \
    --repo=github.com/kubeflow/notebooks/workspaces/controller
kubebuilder create api --version v1beta1 --kind Workspace
kubebuilder create api --version v1beta1 --kind WorkspaceKind
make manifests

TODO:

• [x] think about the branch patterns for GHA triggering (add release branches?)
• integration test with kind (kubeflow/kubeflow notebooks controller has that)
  • separate PR, I'd prefer to merge this scaffold separately from that
  • https://github.com/kubeflow/notebooks/pull/10
  • https://github.com/kubeflow/notebooks/pull/11
• Translate the current CRD spec
  • separate PR, I'd prefer to merge this scaffold separately from that, but up to you ofc
  • https://github.com/kubeflow/notebooks/pull/6
• [x] Declare gha perms/scopes, minimum privilege, because we can

maybe something else from https://docs.google.com/document/d/1SiWLah-U07hAc47sSsoI8-NkbkLnHl1YVzxw193QUKE/edit#heading=h.naudedl8te2q

[thesuperzapper]

@jiridanek I have made a new branch, which we can develop in (rather than main), please make your PR into: https://github.com/kubeflow/notebooks/tree/notebooks-v2

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[thesuperzapper]

/lgtm