Add per-batch verify time metrics to sigverify

[apfitzge]

Problem

• We currently report verify time stats per packet and not per batch
• per-batch timing is useful because when combined with other timing metrics it gives us latency for batch processing in sigverify stage

Summary of Changes

• Add per-batch verify time metrics (90p, max, min, mean) to sigverify stats

Fixes #

[apfitzge]

• probably if we want to do something like this we actually want to report per batch times for the other metrics (discard, dedup, etc) instead of per-packet timings.

@t-nelson you got thoughts on this before I do the work to add those others?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.6%. Comparing base (cd4cf81) to head (3fd5e12).
Report is 78 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #35392     +/-   ##
=========================================
- Coverage    81.6%    81.6%   -0.1%     
=========================================
  Files         834      834             
  Lines      224827   224830      +3     
=========================================
- Hits       183555   183512     -43     
- Misses      41272    41318     +46     

[willhickey]

This repository is no longer in use. Please re-open this pull request in the agave repo: https://github.com/anza-xyz/agave