Add support for pathlib for reading PEtab tables

[dweindl]

Closes #82

[codecov-commenter]

Codecov Report

Merging #93 (f1c709d) into develop (4f6b841) will increase coverage by 0.04%.
The diff coverage is 90.56%.

@@             Coverage Diff             @@
##           develop      #93      +/-   ##
===========================================
+ Coverage    79.65%   79.70%   +0.04%     
===========================================
  Files           26       26              
  Lines         2935     2941       +6     
  Branches       709      709              
===========================================
+ Hits          2338     2344       +6     
  Misses         422      422              
  Partials       175      175              

Impacted Files	Coverage Δ
petab/problem.py	64.47% <33.33%> (ø)
petab/yaml.py	90.78% <92.30%> (ø)
petab/conditions.py	90.69% <100.00%> (+0.22%)	⬆️
petab/core.py	87.02% <100.00%> (+0.09%)	⬆️
petab/measurements.py	82.02% <100.00%> (+0.20%)	⬆️
petab/observables.py	97.14% <100.00%> (+0.04%)	⬆️
petab/parameters.py	86.53% <100.00%> (+0.08%)	⬆️
petab/sbml.py	57.97% <100.00%> (+0.30%)	⬆️

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[dilpath]

👍

Maybe nice to define e.g. petab.C.TYPE_PATH = Union[str, Path], could make the type hints a little neater. Not sure if it can be used as isinstance(..., TYPE_PATH) though.

[dweindl]

Maybe nice to define e.g. petab.C.TYPE_PATH = Union[str, Path], could make the type hints a little neater. Not sure if it can be used as isinstance(..., TYPE_PATH) though.

Does not look very neat, agreed. Briefly thought about it, but then decided that it might be more convenient to users to directly have the types there, without looking up what the other type is...

[dilpath]

Ah, additionally, the tests were changed to use Path, so maybe str is no longer tested? Fine as is though