Create balancer summary scaffolding #119916
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Lays out the balancer summary information that we want to collect and
eventually report. Only the class scaffolding, still needs
implementation.
Relates ES-10341
This is the outline of the balancer round summary stats I want to track. I'll need to run around the code to track and collect the desired information: I expect I'll need to collect some metrics during reconcile(), there's already AllocationStats that tracks some information. ES-10260 outlines what I'm doing in this patch, as well as where I'm headed. Eventually I need to push the metrics from the *SummaryService into the DesiredBalanceMetrics to get pulled by APM (that's a later ticket, ES-10343, but is where things are headed).