* refactor out a consensus data fetcher from table router
* move statement checking logic into router
* refuse to start authority if collator
* support building the table router asynchronously
* instantiate_consensus does not overwrite old
* update key in new consensus if there was none before
* collator collects ingress from network
* test produced egress roots
* fix adder-collator compilation
* address first grumbles
* integrate new gossip with collator network launch
* address review