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In this commit, we fully integrate the new RBF close state machine into the peer. For the restart case after shutdown, we can short circuit the existing logic as the new FSM will handle retransmitting the shutdown message itself, and doesn't need to delegate that duty to the link. Unlike the existing state machine, we're able to restart the flow to sign a coop close with a new higher fee rate. In this case, we can now send multiple updates to the RPC caller, one for each newly singed coop close transaction. To implement the async flush case, we'll launch a new goroutine to wait until the state machine reaches the `ChannelFlushing` state, then we'll register the hook. We don't do this at start up, as otherwise the channel may _already_ be flushed, triggering an invalid state transition.