add petab linter to petab import closes #677

[jvanhoefer]

No description provided.

[codecov-commenter]

Codecov Report

Merging #678 (a4903f1) into develop (0461449) will decrease coverage by 0.07%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop     #678      +/-   ##
===========================================
- Coverage    88.13%   88.05%   -0.08%     
===========================================
  Files           96       96              
  Lines         6363     6365       +2     
===========================================
- Hits          5608     5605       -3     
- Misses         755      760       +5     

Impacted Files	Coverage Δ
pypesto/petab/importer.py	70.00% <50.00%> (-0.26%)	⬇️
pypesto/engine/multi_process.py	92.59% <0.00%> (-7.41%)	⬇️
pypesto/optimize/optimizer.py	89.63% <0.00%> (-0.47%)	⬇️

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[yannikschaelte]

makes sense