Refactor: reorganize statistics mod

[josecelano]

Relates to: #1134

Preparing to introduce new changes in the repository: use Atomics in the repository instead of RwLocks.

[codecov]

Codecov Report

Attention: Patch coverage is 91.59892% with 31 lines in your changes missing coverage. Please review.

Project coverage is 76.20%. Comparing base (2bea7ec) to head (7cf08a6).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/core/statistics/repository.rs	78.30%	23 Missing ⚠️
src/core/statistics/event/handler.rs	96.68%	4 Missing and 1 partial ⚠️
src/core/statistics/keeper.rs	92.50%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1135      +/-   ##
===========================================
+ Coverage    76.17%   76.20%   +0.03%     
===========================================
  Files          169      173       +4     
  Lines        11528    11543      +15     
  Branches     11528    11543      +15     
===========================================
+ Hits          8781     8796      +15     
  Misses        2584     2584              
  Partials       163      163              

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[josecelano]

ACK 7cf08a6