A tool to see a summary of the status of all configs across a cluster

@petersilva suggested that sr3_tools could parse the sr3 dump output to show a quick summary of the status of an entire cluster. Total missing instances, etc.

A check to see if anything is wrong, then sr3 status or other commands can be used to investigate further.

Start by reviewing how sr3_tools parses or exposes sr3 dump output, then compare it with sr3 status and related commands. Done means a cluster-wide summary reports totals such as missing instances and provides a useful check for whether anything is wrong before detailed investigation.

Written by the indexing model from the issue text.