Run multiple replicas of the informer #27
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Before, it was only possible to run 1 replica of the informer because there could be some race conditions.
This PR adds a coordination lease used by all informers, so it's possible to define multiple replicas. Only one replica will be the leader, but if it goes down, at least another one should take the lead.
The lease logic is based on this example: https://github.com/kubernetes/client-go/blob/v0.29.3/examples/leader-election/main.go.