Add callback for picking next server to connect to #1476
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Overview
User needs a way to customize how connections and reconnections are done.
Currently, there are only two modes:
a) client randomizes provided set of servers (and discovered servers)
b) client retains the order
What we want
Ability for the client to alter servers that are picked for reconnection.
Proposed solution
User has access to two callbacks:
Server info callback
When server sends to the client new INFO, which can happen when server discoveres new servers in the cluster
Reconnect callback
When client is about to reconnect
It's different from the current reconnect callback, which is purely informative
TODO