support Key Rotation for RBD Mirror

[ShravaniVangur]

This PR aims to support Key Rotation for RBD Mirror. This includes introducing a new RPC (RotateMirroringKey) to support sharing of Key Generation for the specific cluster.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ShravaniVangur
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[openshift-merge-robot]

PR needs rebase.

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