Overhaul stats: decouple events from stats

[josecelano]

The new events are "generic" events that can be used for any purpose, not only generating stats. This will allow later to create one listener and metrics repository per server (socket address). See #1395.

[josecelano]

ACK 9eba80f

[codecov]

Codecov Report

Attention: Patch coverage is 91.22807% with 15 lines in your changes missing coverage. Please review.

Project coverage is 82.00%. Comparing base (34c4249) to head (9eba80f).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/http-tracker-core/src/event/mod.rs	70.00%	6 Missing ⚠️
packages/udp-tracker-core/src/event/mod.rs	50.00%	6 Missing ⚠️
packages/udp-tracker-server/src/event/mod.rs	75.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1400      +/-   ##
===========================================
- Coverage    82.01%   82.00%   -0.02%     
===========================================
  Files          232      232              
  Lines        17051    17036      -15     
  Branches     17051    17036      -15     
===========================================
- Hits         13985    13970      -15     
  Misses        2821     2821              
  Partials       245      245              

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