Remove mathml2sympy

[dweindl]

For spline handling, replace mathml2sympy by sbmlmath functions. Related to #2146.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.38%. Comparing base (84b9d8d) to head (5bc059a).
⚠️ Report is 75 commits behind head on main.

Files with missing lines	Patch %	Lines
python/sdist/amici/exporters/sundials/de_export.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3020      +/-   ##
==========================================
- Coverage   78.02%   77.38%   -0.65%     
==========================================
  Files         311      311              
  Lines       20598    20584      -14     
  Branches     1499     1500       +1     
==========================================
- Hits        16071    15928     -143     
- Misses       4517     4646     +129     
  Partials       10       10              

Flag	Coverage Δ
cpp	70.30% <14.28%> (-0.03%)	⬇️
cpp_python	36.74% <85.71%> (-0.04%)	⬇️
petab	45.71% <0.00%> (+0.02%)	⬆️
petab_sciml	13.65% <0.00%> (-0.01%)	⬇️
python	69.32% <85.71%> (-0.02%)	⬇️
sbmlsuite-jax	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
python/sdist/amici/sbml_import.py	82.20% <ø> (-12.08%)	⬇️
python/sdist/amici/sbml_utils.py	80.57% <ø> (-0.84%)	⬇️
python/sdist/amici/splines.py	80.59% <100.00%> (+0.03%)	⬆️
python/sdist/amici/exporters/sundials/de_export.py	96.91% <83.33%> (+0.01%)	⬆️

... and 5 files with indirect coverage changes

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[dweindl]

FIXME: codeprinter: print all sympy.Integers as floats.