Add stats for packet rate organized by conference size.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #2013 (ad9f21f) into master (c3028de) will decrease coverage by 0.12%.
The diff coverage is 4.08%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2013      +/-   ##
============================================
- Coverage     42.90%   42.78%   -0.12%     
  Complexity     1678     1678              
============================================
  Files           325      326       +1     
  Lines         16944    16995      +51     
  Branches       2238     2240       +2     
============================================
+ Hits           7270     7272       +2     
- Misses         8963     9012      +49     
  Partials        711      711              

Impacted Files	Coverage Δ
...a/org/jitsi/videobridge/rest/root/debug/Debug.java	24.07% <0.00%> (-0.23%)	⬇️
...jitsi/videobridge/stats/VideobridgeStatistics.java	0.30% <0.00%> (-0.02%)	⬇️
...g/jitsi/videobridge/stats/ConferencePacketStats.kt	0.00% <0.00%> (ø)
...tsi/videobridge/stats/config/StatsManagerConfig.kt	86.04% <ø> (ø)
...tsi/videobridge/rest/root/debug/DebugFeatures.java	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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