Overhaul stats: Use broadcast channel for events in UDP Core

[josecelano]

This continues this refactor for the UDP core package.

[josecelano]

ACK d2de1de

[codecov]

Codecov Report

Attention: Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.99%. Comparing base (50463ae) to head (d2de1de).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../udp-tracker-core/src/statistics/event/listener.rs	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1393      +/-   ##
===========================================
+ Coverage    81.88%   81.99%   +0.11%     
===========================================
  Files          232      232              
  Lines        17081    17066      -15     
  Branches     17081    17066      -15     
===========================================
+ Hits         13987    13994       +7     
+ Misses        2841     2828      -13     
+ Partials       253      244       -9     

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