Created shorter Cluster config api

[artem-v]

Motivation

Provide shorted api for cluster configuration. Existing approach is not handy when client needs to define only some portion of config and not all the properties.

Updated

new ClusterImpl()
  .transport(opts -> opts.port(port))
  .membership(opts -> opts.seedMembers(addresses))

instead of previous approach:

new ClusterImpl()
  .config(config -> 
    config.transport(opts -> opts.port(port)))
    config.membership(opts -> opts.seedMembers(addresses))

[ronenhamias]

maybe not instead but in addition?

[artem-v]

maybe not instead but in addition?

yes
client still has .config(UnaryOperator) and constructor with ClusterConfig, these methods left unchanged