Renderer refactor

[kfdm]

No description provided.

[codecov-io]

Codecov Report

Merging #239 into master will decrease coverage by 0.23%.
The diff coverage is 27.27%.

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
- Coverage   46.52%   46.28%   -0.24%     
==========================================
  Files          51       51              
  Lines        2592     2614      +22     
==========================================
+ Hits         1206     1210       +4     
- Misses       1386     1404      +18

Impacted Files	Coverage Δ
promgen/tasks.py	43.37% <0%> (ø)	⬆️
promgen/views.py	48.67% <0%> (-0.01%)	⬇️
promgen/renderers.py	21.05% <27.27%> (+8.55%)	⬆️
promgen/serializers.py	14.73% <5.55%> (-5.61%)	⬇️
promgen/prometheus.py	74.1% <50%> (+13.54%)	⬆️
promgen/rest.py	70.58% <68.18%> (-4.42%)	⬇️

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