network: enable vote compression for P2PNetwork

[cce]

Summary

Now that #6276 and #6312 have been merged, the configuration to enable vote compression needs to be wired up to the P2PNetwork implementation, and this is the missing initialization to do so.

Test Plan

Network performance testing, plus new unit test TestP2PVoteCompression.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.86%. Comparing base (ad67b95) to head (8f9d209).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6331      +/-   ##
==========================================
- Coverage   51.87%   51.86%   -0.02%     
==========================================
  Files         653      653              
  Lines       87545    87547       +2     
==========================================
- Hits        45417    45404      -13     
- Misses      39260    39267       +7     
- Partials     2868     2876       +8     

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