Combine observables, sigmas and noise distributions parameters for model import

[dweindl]

Combine observables, sigmas and noise distributions parameters for model import

Closes #2923.

[codecov]

Codecov Report

❌ Patch coverage is 92.94118% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.62%. Comparing base (5e0acb2) to head (d4d4a80).
⚠️ Report is 122 commits behind head on main.

Files with missing lines	Patch %	Lines
python/sdist/amici/de_model.py	83.33%	2 Missing ⚠️
python/sdist/amici/sbml_import.py	94.11%	2 Missing ⚠️
python/sdist/amici/import_utils.py	93.75%	1 Missing ⚠️
python/sdist/amici/petab/import_helpers.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2959      +/-   ##
==========================================
- Coverage   77.29%   76.62%   -0.67%     
==========================================
  Files         307      307              
  Lines       19912    19901      -11     
  Branches     1502     1501       -1     
==========================================
- Hits        15391    15250     -141     
- Misses       4508     4638     +130     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.78% <90.58%> (+0.01%)	⬆️
cpp_python	38.33% <76.47%> (+0.02%)	⬆️
petab	39.39% <69.41%> (+0.03%)	⬆️
python	70.34% <92.94%> (+0.01%)	⬆️
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/__init__.py	96.07% <ø> (ø)
python/sdist/amici/petab/pysb_import.py	61.76% <ø> (ø)
python/sdist/amici/petab/sbml_import.py	74.60% <100.00%> (+0.20%)	⬆️
python/sdist/amici/pysb_import.py	94.76% <100.00%> (+0.19%)	⬆️
python/sdist/amici/testing/models.py	98.36% <ø> (ø)
python/tests/conftest.py	39.28% <ø> (ø)
python/sdist/amici/import_utils.py	81.64% <93.75%> (-2.13%)	⬇️
python/sdist/amici/petab/import_helpers.py	85.71% <91.66%> (-1.25%)	⬇️
python/sdist/amici/de_model.py	92.33% <83.33%> (-0.60%)	⬇️
python/sdist/amici/sbml_import.py	81.40% <94.11%> (-10.97%)	⬇️

... and 4 files with indirect coverage changes

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