Add missing fields in ExpData HDF5 I/O

[dweindl]

Closes #2589

[codecov]

Codecov Report

Attention: Patch coverage is 31.14754% with 42 lines in your changes missing coverage. Please review.

Project coverage is 77.50%. Comparing base (7ba2165) to head (c0b161d).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/hdf5.cpp	31.14%	42 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2593      +/-   ##
===========================================
- Coverage    77.63%   77.50%   -0.13%     
===========================================
  Files          329      329              
  Lines        22061    22122      +61     
  Branches      1456     1474      +18     
===========================================
+ Hits         17126    17145      +19     
- Misses        4924     4966      +42     
  Partials        11       11              

Flag	Coverage Δ
cpp	73.44% <31.14%> (-0.12%)	⬇️
cpp_python	34.20% <0.00%> (-0.10%)	⬇️
petab	37.09% <0.00%> (-0.15%)	⬇️
python	72.20% <6.66%> (-0.19%)	⬇️

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Files with missing lines	Coverage Δ
src/hdf5.cpp	84.48% <31.14%> (-4.53%)	⬇️

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