Function paxos_bench 

pub fn paxos_bench<'a>(
    num_clients_per_node: usize,
    checkpoint_frequency: usize,
    f: usize,
    num_replicas: usize,
    paxos: impl PaxosLike<'a>,
    clients: &Cluster<'a, Client>,
    client_aggregator: &Process<'a, Aggregator>,
    replicas: &Cluster<'a, Replica>,
)