refactor: Use designated initializers for ModelDimensions

[dweindl]

Improves readability/maintainability.

[codecov]

Codecov Report

❌ Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.59%. Comparing base (dbf0ac2) to head (0aead10).
⚠️ Report is 126 commits behind head on main.

Files with missing lines	Patch %	Lines
models/model_calvetti_py/model_calvetti_py.h	50.00%	1 Missing ⚠️
models/model_dirac_py/model_dirac_py.h	50.00%	1 Missing ⚠️
models/model_events_py/model_events_py.h	50.00%	1 Missing ⚠️
...odel_jakstat_adjoint_py/model_jakstat_adjoint_py.h	50.00%	1 Missing ⚠️
...ls/model_nested_events_py/model_nested_events_py.h	50.00%	1 Missing ⚠️
models/model_neuron_py/model_neuron_py.h	50.00%	1 Missing ⚠️
models/model_robertson_py/model_robertson_py.h	50.00%	1 Missing ⚠️
models/model_steadystate_py/model_steadystate_py.h	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2958      +/-   ##
==========================================
- Coverage   77.15%   76.59%   -0.56%     
==========================================
  Files         307      307              
  Lines       19933    19916      -17     
  Branches     1502     1502              
==========================================
- Hits        15379    15255     -124     
- Misses       4541     4648     +107     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.75% <57.89%> (+0.11%)	⬆️
cpp_python	38.30% <15.78%> (+0.04%)	⬆️
petab	39.36% <100.00%> (-0.10%)	⬇️
python	70.31% <57.89%> (-0.07%)	⬇️
sbmlsuite-jax	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
include/amici/model_dimensions.h	100.00% <100.00%> (+54.28%)	⬆️
src/model.cpp	85.37% <100.00%> (+<0.01%)	⬆️
src/rdata.cpp	82.59% <100.00%> (+0.02%)	⬆️
models/model_calvetti_py/model_calvetti_py.h	58.02% <50.00%> (+1.06%)	⬆️
models/model_dirac_py/model_dirac_py.h	58.44% <50.00%> (+0.27%)	⬆️
models/model_events_py/model_events_py.h	65.89% <50.00%> (+1.01%)	⬆️
...odel_jakstat_adjoint_py/model_jakstat_adjoint_py.h	69.87% <50.00%> (-0.20%)	⬇️
...ls/model_nested_events_py/model_nested_events_py.h	62.89% <50.00%> (+0.71%)	⬆️
models/model_neuron_py/model_neuron_py.h	72.02% <50.00%> (ø)
models/model_robertson_py/model_robertson_py.h	53.37% <50.00%> (-0.32%)	⬇️
... and 1 more

... and 10 files with indirect coverage changes

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[FFroehlich]

nice!