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feat(core): setServers/getServers (#400)

* feat(core): setServers/getServers

This PR adds the ability to set and replace the server list. This enables setting a server list, and issuing a reconnect() to migrate to new servers discovered or injected by an external mechanism. Setting the server list to empty will throw an exception.

In addition there are some internal changes to support `reconnectToServer`, this is an
advanced feature that enables a client at the time of a reconnect to select the server
to connect to (and if to delay the dial to that server) from the list of provided servers. This feature is fully implemented but stealthy. Must specify the `reconnectToServer` option

Also updated the cluster to use a TUI and added the chaos_client tool (these are internal tools that are very useful for exercising flapping clusters and reconnect)

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