Function index_payloads

pub fn index_payloads<'a, P: PaxosPayload>(
    proposer_tick: &Tick<Cluster<'a, Proposer>>,
    p_max_slot: Optional<usize, Tick<Cluster<'a, Proposer>>, Bounded>,
    c_to_proposers: Stream<P, Tick<Cluster<'a, Proposer>>, Bounded>,
) -> Stream<(usize, P), Tick<Cluster<'a, Proposer>>, Bounded>