refactor: code printing - initializer lists

[dweindl]

DRY.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.00%. Comparing base (ce28017) to head (32faf1b).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2785      +/-   ##
===========================================
- Coverage    78.03%   78.00%   -0.03%     
===========================================
  Files          329      329              
  Lines        23224    23228       +4     
  Branches      1510     1510              
===========================================
- Hits         18122    18119       -3     
- Misses        5093     5100       +7     
  Partials         9        9              

Flag	Coverage Δ
cpp	74.91% <100.00%> (-0.04%)	⬇️
cpp_python	33.79% <100.00%> (ø)
petab	39.34% <100.00%> (+<0.01%)	⬆️
python	72.94% <100.00%> (-0.03%)	⬇️

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Files with missing lines	Coverage Δ
python/sdist/amici/_codegen/model_class.py	100.00% <100.00%> (ø)
python/sdist/amici/cxxcodeprinter.py	92.30% <100.00%> (+0.13%)	⬆️
python/sdist/amici/de_export.py	95.28% <100.00%> (+0.03%)	⬆️

... and 2 files with indirect coverage changes

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