Feature Request: Transition the Node component to become a HostProcess Pod

[mauriciopoppe]

A HostProcess pod can execute privileged storage operations directly, the idea to use it in PD CSI Driver is:

• Refactor CSI Proxy to become a library.
• Replace the client code in PD CSI Driver that uses the gRPC client with imports of the internal implementation of CSI Proxy.
• Update the node PD CSI Driver Windows manifests adding a section like:

spec:
  securityContext:
    windowsOptions:
      hostProcess: true
      runAsUserName: "NT AUTHORITY\\Local service"

The design doc is in (TODO: link to KEP)

[alexander-ding]

The CSI Proxy change is tracked by KEP-3636. The PD CSI Driver changes are available via #1070

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[mauriciopoppe]

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