WIP: dump query processing performance metrics from various stages #3371
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Depends on #3319 and #3323 and reviewable only after they are merged.
Fixes #3324
it can be enabled by sending "dumpQueryPerf" attribute in query context, value is expected to be an integer.
1 means only dump stats from broker
1+ means include stats from historicals too , bigger number means more segment's stats will be reported.