Update imports/exports

[dweindl]

Simplify some imports. Fix type annotations. Import extension types only where necessary.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.53%. Comparing base (1a80258) to head (7c110a6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3092      +/-   ##
==========================================
- Coverage   78.22%   77.53%   -0.70%     
==========================================
  Files         315      315              
  Lines       20480    20481       +1     
  Branches     1500     1500              
==========================================
- Hits        16021    15880     -141     
- Misses       4450     4592     +142     
  Partials        9        9              

Flag	Coverage Δ
cpp	71.67% <100.00%> (-0.04%)	⬇️
cpp_python	37.68% <75.00%> (-0.01%)	⬇️
petab	46.39% <75.00%> (-0.01%)	⬇️
petab_sciml	13.75% <75.00%> (-0.01%)	⬇️
python	70.31% <100.00%> (-0.04%)	⬇️
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/importers/pysb/__init__.py	94.64% <ø> (ø)
python/sdist/amici/importers/sbml/__init__.py	82.31% <ø> (-11.99%)	⬇️
.../amici/importers/sbml/conserved_quantities_rref.py	96.49% <100.00%> (ø)
python/sdist/amici/sim/sundials/_numpy.py	87.42% <100.00%> (ø)
python/sdist/amici/sim/sundials/gradient_check.py	93.38% <ø> (-6.62%)	⬇️
...thon/sdist/amici/sim/sundials/petab/v1/__init__.py	100.00% <ø> (ø)
.../sdist/amici/sim/sundials/petab/v1/_simulations.py	94.73% <ø> (ø)
python/sdist/amici/testing/models.py	98.38% <100.00%> (+0.02%)	⬆️

... and 4 files with indirect coverage changes

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