Move symbolic model to amici._symbolic

[dweindl]

Closes #3040.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.15%. Comparing base (5b6d241) to head (27977b0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...hon/sdist/amici/importers/petab/_petab_importer.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3058      +/-   ##
==========================================
+ Coverage   78.13%   78.15%   +0.02%     
==========================================
  Files         311      312       +1     
  Lines       20641    20643       +2     
  Branches     1499     1499              
==========================================
+ Hits        16127    16133       +6     
+ Misses       4504     4500       -4     
  Partials       10       10              

Flag	Coverage Δ
cpp	70.79% <62.50%> (+0.02%)	⬆️
cpp_python	37.24% <62.50%> (+<0.01%)	⬆️
petab	45.86% <87.50%> (+<0.01%)	⬆️
petab_sciml	13.78% <37.50%> (+0.01%)	⬆️
python	69.44% <62.50%> (+0.01%)	⬆️
sbmlsuite-jax	32.71% <37.50%> (+0.02%)	⬆️

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

Files with missing lines	Coverage Δ
python/sdist/amici/_symbolic/__init__.py	100.00% <100.00%> (ø)
python/sdist/amici/_symbolic/de_model.py	91.86% <ø> (ø)
...ython/sdist/amici/_symbolic/de_model_components.py	93.10% <ø> (ø)
python/sdist/amici/_symbolic/sympy_utils.py	78.87% <100.00%> (ø)
python/sdist/amici/exporters/sundials/de_export.py	96.38% <100.00%> (ø)
python/sdist/amici/importers/pysb/__init__.py	94.54% <ø> (ø)
python/sdist/amici/importers/sbml/__init__.py	94.45% <ø> (ø)
python/sdist/amici/jax/ode_export.py	88.33% <ø> (ø)
...hon/sdist/amici/importers/petab/_petab_importer.py	89.69% <66.66%> (ø)

... and 3 files with indirect coverage changes

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