Strategy to evict stale endpoints

[runakash]

As per the Multi-Cluster Services API, we need to define the strategy for below

Endpoint TTL

To prevent stale endpoints from persisting in the event that the mcs-controller is unable to reach a cluster, it is recommended that an implementation provide an in-cluster controller to monitor and remove stale endpoints. This may be the mcs-controller itself in distributed implementations.

We recommend creating leases to represent connectivity with source clusters. These leases should be periodically renewed by the mcs-controller while the connection with the source cluster is confirmed alive. When a lease expires, the cluster name and multicluster.kubernetes.io/source-cluster label may be used to find and remove all EndpointSlices containing endpoints from the unreachable cluster.