More informative exceptions

[dweindl]

• Add more context to exceptions
• Convert NotImplementedErrors during SBML import to SBMLException as done in other places

[codecov]

Codecov Report

❌ Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.37%. Comparing base (7bf3b76) to head (327a8a6).
⚠️ Report is 61 commits behind head on main.

Files with missing lines	Patch %	Lines
python/sdist/amici/gradient_check.py	40.00%	3 Missing ⚠️
python/sdist/amici/exporters/sundials/de_export.py	50.00%	2 Missing ⚠️
python/sdist/amici/importers/sbml/__init__.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3037      +/-   ##
==========================================
- Coverage   77.41%   77.37%   -0.04%     
==========================================
  Files         311      311              
  Lines       20594    20603       +9     
  Branches     1500     1499       -1     
==========================================
- Hits        15942    15941       -1     
- Misses       4642     4652      +10     
  Partials       10       10              

Flag	Coverage Δ
cpp	70.30% <53.84%> (-0.04%)	⬇️
cpp_python	36.74% <53.84%> (-0.01%)	⬇️
petab	45.72% <53.84%> (-0.01%)	⬇️
petab_sciml	13.65% <0.00%> (-0.01%)	⬇️
python	69.32% <53.84%> (-0.03%)	⬇️

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

Files with missing lines	Coverage Δ
python/sdist/amici/importers/pysb/__init__.py	94.54% <ø> (ø)
python/sdist/amici/importers/sbml/__init__.py	82.13% <75.00%> (-0.07%)	⬇️
python/sdist/amici/exporters/sundials/de_export.py	96.38% <50.00%> (-0.53%)	⬇️
python/sdist/amici/gradient_check.py	93.33% <40.00%> (-2.36%)	⬇️

... and 3 files with indirect coverage changes

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