Use petab.v1

[dweindl]

Make amici ready for using libpetab's petab.v1 package instead of the previous, now deprecated imports.

Move tests/petab to tests/petab_ to avoid import issues (tests.petab namespace package vs actual petab package)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.61%. Comparing base (9fe31b6) to head (b56235a).
Report is 33 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2471      +/-   ##
===========================================
+ Coverage    76.20%   77.61%   +1.40%     
===========================================
  Files          319      324       +5     
  Lines        20772    20933     +161     
  Branches      1462     1464       +2     
===========================================
+ Hits         15830    16247     +417     
+ Misses        4938     4683     -255     
+ Partials         4        3       -1     

Flag	Coverage Δ
cpp	73.37% <ø> (-0.02%)	⬇️
cpp_python	34.08% <ø> (ø)
petab	36.64% <ø> (?)
python	72.15% <ø> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
python/sdist/amici/petab/cli/import_petab.py	0.00% <ø> (ø)
python/sdist/amici/petab/conditions.py	97.43% <ø> (+23.93%)	⬆️
python/sdist/amici/petab/import_helpers.py	86.15% <ø> (+7.69%)	⬆️
python/sdist/amici/petab/parameter_mapping.py	81.15% <ø> (+28.27%)	⬆️
python/sdist/amici/petab/petab_import.py	66.66% <ø> (ø)
python/sdist/amici/petab/petab_problem.py	87.69% <ø> (+87.69%)	⬆️
python/sdist/amici/petab/pysb_import.py	51.85% <ø> (+46.29%)	⬆️
python/sdist/amici/petab/sbml_import.py	54.28% <ø> (+27.14%)	⬆️
python/sdist/amici/petab/simulations.py	92.85% <ø> (+22.44%)	⬆️
python/sdist/amici/petab/simulator.py	100.00% <ø> (+100.00%)	⬆️
... and 5 more

... and 8 files with indirect coverage changes