Migration to juliacall

[PaulJonasJost]

As tests for 3.14 are failing, trying to migrate once to juliacall and see whether it fixes it.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.48%. Comparing base (3614541) to head (d7207b7).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
pypesto/objective/julia/petabJl.py	0.00%	39 Missing ⚠️
pypesto/objective/julia/base.py	0.00%	10 Missing ⚠️
pypesto/objective/julia/petab_jl_importer.py	0.00%	5 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1721      +/-   ##
===========================================
- Coverage    84.35%   83.48%   -0.87%     
===========================================
  Files          164      164              
  Lines        14756    14788      +32     
===========================================
- Hits         12447    12346     -101     
- Misses        2309     2442     +133     

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