Add function for writing ExpData to HDF5

[dweindl]

So far, there was only a H5File-based version, which is inconvenient to use from Python.

This allows passing a file name instead.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.63%. Comparing base (2a25b27) to head (8d589f8).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/hdf5.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2588      +/-   ##
===========================================
+ Coverage    77.60%   77.63%   +0.03%     
===========================================
  Files          329      329              
  Lines        22055    22059       +4     
  Branches      1456     1456              
===========================================
+ Hits         17116    17126      +10     
+ Misses        4928     4922       -6     
  Partials        11       11              

Flag	Coverage Δ
cpp	73.57% <0.00%> (+0.03%)	⬆️
cpp_python	34.30% <0.00%> (-0.01%)	⬇️
petab	37.24% <0.00%> (-0.01%)	⬇️
python	72.39% <0.00%> (+0.03%)	⬆️

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Files with missing lines	Coverage Δ
src/hdf5.cpp	89.01% <0.00%> (-0.50%)	⬇️

... and 1 file with indirect coverage changes

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