tests: add TestConnMonitor_Simulate

[algorandskiy]

Summary

Add a simple simulator for connPerfMonitor adjustments.

=== RUN   TestConnMonitor_Simulate/normalShuffle
    connPerfMon_test.go:406: Monitor advanced to stage 0 at tick 0
    connPerfMon_test.go:406: Monitor advanced to stage 1 at tick 186175
    connPerfMon_test.go:406: Monitor advanced to stage 2 at tick 660343
    connPerfMon_test.go:406: Monitor advanced to stage 3 at tick 2498931
    connPerfMon_test.go:418: normalShuffle:  6139854 messages over 2755276 ticks
    connPerfMon_test.go:420: noDupPeer2: delay=3502742912 firstMessagePercentage=0.05
    connPerfMon_test.go:420: noDupPeer1: delay=3502742911 firstMessagePercentage=0.06
    connPerfMon_test.go:420: dupPeer1: delay=3352688862 firstMessagePercentage=0.10
    connPerfMon_test.go:420: dupPeer2: delay=3285503228 firstMessagePercentage=0.09
    connPerfMon_test.go:420: dupPeer3: delay=3198444157 firstMessagePercentage=0.08
    connPerfMon_test.go:420: dupPlusPeer3: delay=508228763 firstMessagePercentage=0.12
    connPerfMon_test.go:420: dupPlusPeer2: delay=508228751 firstMessagePercentage=0.20
    connPerfMon_test.go:420: dupPlusPeer1: delay=508228737 firstMessagePercentage=0.30
=== RUN   TestConnMonitor_Simulate/uniformShuffle
    connPerfMon_test.go:406: Monitor advanced to stage 0 at tick 0
    connPerfMon_test.go:406: Monitor advanced to stage 1 at tick 186769
    connPerfMon_test.go:406: Monitor advanced to stage 2 at tick 656594
    connPerfMon_test.go:406: Monitor advanced to stage 3 at tick 2497457
    connPerfMon_test.go:418: uniformShuffle:  6527665 messages over 2763951 ticks
    connPerfMon_test.go:420: noDupPeer1: delay=3589952936 firstMessagePercentage=0.03
    connPerfMon_test.go:420: noDupPeer2: delay=3589952936 firstMessagePercentage=0.03
    connPerfMon_test.go:420: dupPeer3: delay=3208482689 firstMessagePercentage=0.10
    connPerfMon_test.go:420: dupPeer1: delay=3207660803 firstMessagePercentage=0.10
    connPerfMon_test.go:420: dupPeer2: delay=3207169049 firstMessagePercentage=0.10
    connPerfMon_test.go:420: dupPlusPeer2: delay=769858793 firstMessagePercentage=0.21
    connPerfMon_test.go:420: dupPlusPeer3: delay=769858793 firstMessagePercentage=0.21
    connPerfMon_test.go:420: dupPlusPeer1: delay=769858793 firstMessagePercentage=0.21
--- PASS: TestConnMonitor_Simulate (328.72s)

Test Plan

This is a new test.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.70%. Comparing base (5159152) to head (03cf132).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6519      +/-   ##
==========================================
- Coverage   47.83%   47.70%   -0.14%     
==========================================
  Files         662      655       -7     
  Lines       87940    87855      -85     
==========================================
- Hits        42063    41908     -155     
- Misses      43108    43175      +67     
- Partials     2769     2772       +3     

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