RpcLoadBalancer.LoadBalancer.SelectionAlgorithm.RoundRobin
(rpc_load_balancer v0.3.6)
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Round robin node selection algorithm.
Uses a shared atomic :counters slot (via CounterCache) to cycle
through nodes. Selection is one atomic increment plus an Enum.at/2,
constant in cluster size. The counter resets after 10,000,000 picks.