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23d10336c2
This commit creates a distinct replyHandler, completely isolating the
requesting state machine from the processing of queries from the remote
peer. Before the two were interlaced, and the syncer could only reply to
messages in certain states. Now the two will be complete separated,
which is preliminary step to make the replies synchronous (as otherwise
we would be blocking our own requesting state machine).
With this changes, the channelGraphSyncer of each peer will drive the
replyHanlder of the other. The two can now operate independently, or
even spun up conditionally depending on advertised support for gossip
queries, as shown below:
A B
channelGraphSyncer ---control-msg--->
replyHandler
channelGraphSyncer <--control-msg----
gossiper <--gossip-msgs----
<--control-msg---- channelGraphSyncer
replyHandler
---control-msg---> channelGraphSyncer
---gossip-msgs---> gossiper