Extend support for extracting common subexpressions

[dweindl]

Extend support for extracting common subexpressions to previously unsupported functions such as sx0. Add tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.43%. Comparing base (b832ca3) to head (86c96b0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3170      +/-   ##
==========================================
- Coverage   78.05%   77.43%   -0.63%     
==========================================
  Files         317      317              
  Lines       20903    20909       +6     
  Branches     1483     1483              
==========================================
- Hits        16316    16190     -126     
- Misses       4579     4711     +132     
  Partials        8        8              

Flag	Coverage Δ
cpp	71.57% <100.00%> (+<0.01%)	⬆️
cpp_python	36.71% <62.50%> (+<0.01%)	⬆️
petab	46.78% <62.50%> (+<0.01%)	⬆️
petab_sciml	15.54% <12.50%> (-0.01%)	⬇️
python	68.32% <100.00%> (+<0.01%)	⬆️
sbmlsuite-jax	?

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Files with missing lines	Coverage Δ
...n/sdist/amici/exporters/sundials/cxxcodeprinter.py	95.79% <100.00%> (+0.22%)	⬆️
python/sdist/amici/exporters/sundials/de_export.py	96.44% <ø> (ø)

... and 4 files with indirect coverage changes

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