Nicer __repr__ for ReturnDataView

[dweindl]

Previously:

<ReturnDataView(<amici.amici.ReturnData; proxy of <Swig Object of type 'amici::ReturnData *' at 0x7f794a9ef8d0> >)>

Now:

<ReturnDataView(id='ctrl+basal_preeq', status=AMICI_SUCCESS)>

[codecov]

Codecov Report

Merging #2192 (7435163) into develop (269910b) will decrease coverage by 0.85%.
Report is 1 commits behind head on develop.
The diff coverage is 33.33%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2192      +/-   ##
===========================================
- Coverage    77.45%   76.60%   -0.85%     
===========================================
  Files           82       82              
  Lines        15004    15007       +3     
===========================================
- Hits         11621    11496     -125     
- Misses        3383     3511     +128     

Flag	Coverage Δ
cpp	73.53% <ø> (ø)
petab	53.83% <33.33%> (-0.02%)	⬇️
python	77.14% <33.33%> (-2.31%)	⬇️
sbmlsuite	?

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Files	Coverage Δ
python/sdist/amici/numpy.py	81.37% <33.33%> (-1.46%)	⬇️

... and 1 file with indirect coverage changes