Add __repr__ for parameter mapping classes

[dweindl]

Convenient for debugging.

[codecov]

Codecov Report

Merging #1799 (c5d7d3c) into develop (8546384) will increase coverage by 0.02%.
The diff coverage is 57.14%.

@@             Coverage Diff             @@
##           develop    #1799      +/-   ##
===========================================
+ Coverage    77.55%   77.58%   +0.02%     
===========================================
  Files           74       74              
  Lines        12346    12349       +3     
===========================================
+ Hits          9575     9581       +6     
+ Misses        2771     2768       -3     

Flag	Coverage Δ
cpp	74.31% <ø> (+0.06%)	⬆️
petab	60.75% <57.14%> (-0.02%)	⬇️
python	68.17% <28.57%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
python/amici/parameter_mapping.py	75.20% <57.14%> (-1.07%)	⬇️
src/solver_cvodes.cpp	70.52% <0.00%> (+0.16%)	⬆️
src/sundials_matrix_wrapper.cpp	81.41% <0.00%> (+0.41%)	⬆️
src/exception.cpp	81.08% <0.00%> (+5.40%)	⬆️

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

28.6% Coverage
0.0% Duplication

[FFroehlich]

👍