refactor: Use mutex from utils

[kuznetsss]

Fixes #1359.

[codecov]

Codecov Report

Attention: Patch coverage is 92.45283% with 4 lines in your changes missing coverage. Please review.

Project coverage is 71.62%. Comparing base (6ef6ca9) to head (9d3484e).

Files with missing lines	Patch %	Lines
src/util/prometheus/impl/HistogramImpl.hpp	75.00%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1851      +/-   ##
===========================================
+ Coverage    71.61%   71.62%   +0.01%     
===========================================
  Files          330      330              
  Lines        13413    13411       -2     
  Branches      6826     6824       -2     
===========================================
  Hits          9606     9606              
  Misses        1922     1922              
+ Partials      1885     1883       -2     

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[godexsoft]

Not a fan of how more places need to write template now and even less of a fan of operator[](m) but it works. You can avoid the extra template via a helper function but that makes the API less discoverable so that's a trade off I suppose.