add support Lease-based leader election (rather than ConfigMaps) #1877

[rvlane]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Enhance leaderelection module to support V1Lease based lease lock.

Which issue(s) this PR fixes:

Fixes #1877

Special notes for your reviewer:

Have coded this such that the LeaderElectionRecord is unchanged to ensure backward compatibility with anyone using the existing structures.

Does this PR introduce a user-facing change?

None

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rvlane
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[rvlane]

@Invictus17 - can you please review this also? Thankis

[Invictus17]

I'm not able to assign myself as reviewer @rvlane.