This PR does a few things:
1) Add fetch messages implementation on any kind of chat. It's behind a
toggle (on by default) as design is still unsure whether we want it,
but it's very useful for debugging.
2) Allow setting light client from mobile
It also partially remove node config management from the clojure part,
as it's better if that's not explicitly managed by clients.
Some parts are still relying on it but they are not functional
(keycard), while others are still using it and will need to be updated
eventually (syncing), in order to get rid completely of node config.
Sets fleet to shards.test
https://github.com/status-im/status-go/compare/90c31afe...1adcf02f
Andrea Maria Piana