refactor(database/prometheus): Improve metrics encoding pipeline

[gfieni]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.18%. Comparing base (22f1765) to head (a0938ab).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/powerapi/database/prometheus/collectors.py	50.00%	6 Missing ⚠️
src/powerapi/database/prometheus/codecs.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #821      +/-   ##
==========================================
+ Coverage   71.07%   71.18%   +0.11%     
==========================================
  Files          89       89              
  Lines        2956     2957       +1     
==========================================
+ Hits         2101     2105       +4     
+ Misses        855      852       -3     

Files with missing lines	Coverage Δ
src/powerapi/database/prometheus/driver.py	62.16% <100.00%> (+1.05%)	⬆️
src/powerapi/database/prometheus/codecs.py	80.00% <77.77%> (+1.42%)	⬆️
src/powerapi/database/prometheus/collectors.py	69.04% <50.00%> (+4.46%)	⬆️

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