Enable pickling of ExpData

[dweindl]

Enables pickling of ExpData.

Related to #1126.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.81%. Comparing base (b8307a1) to head (deca79d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2986      +/-   ##
==========================================
- Coverage   76.50%   75.81%   -0.70%     
==========================================
  Files         308      308              
  Lines       20149    19529     -620     
  Branches     1500     1500              
==========================================
- Hits        15415    14805     -610     
+ Misses       4721     4711      -10     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.90% <100.00%> (-0.12%)	⬇️
cpp_python	38.28% <11.11%> (-0.02%)	⬇️
petab	38.88% <11.11%> (-0.03%)	⬇️
python	69.64% <100.00%> (-0.01%)	⬇️
sbmlsuite-jax	?

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Files with missing lines	Coverage Δ
python/sdist/amici/swig_wrappers.py	99.02% <100.00%> (+0.09%)	⬆️

... and 49 files with indirect coverage changes

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