Support Leader Election

[leakingtapan]

Is your feature request related to a problem? Please describe.
To improve availability of controller service when it is being restarted or rescheduled. We should support leader election for controller service.

After this we could switch to use deployment for controller service instead of stateful set.

Ref

• https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/pull/112/files

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[leakingtapan]

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