Refactor: snake case

[dweindl]

Convert remaining function names to snake-case. Closes #887.

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.03%. Comparing base (7f15329) to head (6712ff8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/edata.cpp	76.92%	3 Missing ⚠️
src/model_dae.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3017      +/-   ##
==========================================
- Coverage   76.71%   76.03%   -0.68%     
==========================================
  Files         309      309              
  Lines       19899    19899              
  Branches     1497     1497              
==========================================
- Hits        15265    15130     -135     
- Misses       4621     4756     +135     
  Partials       13       13              

Flag	Coverage Δ
cpp	72.49% <94.11%> (ø)
cpp_python	37.89% <29.41%> (ø)
petab	38.52% <24.61%> (ø)
petab_sciml	14.15% <0.00%> (ø)
python	69.31% <94.11%> (ø)
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/abstract_model.h	100.00% <ø> (ø)
include/amici/edata.h	100.00% <ø> (ø)
include/amici/model_dae.h	80.00% <ø> (ø)
include/amici/model_ode.h	100.00% <ø> (ø)
include/amici/rdata.h	100.00% <ø> (ø)
src/hdf5.cpp	66.74% <100.00%> (ø)
src/model.cpp	85.64% <100.00%> (ø)
src/model_ode.cpp	67.25% <100.00%> (ø)
src/rdata.cpp	81.65% <100.00%> (ø)
src/solver.cpp	79.68% <100.00%> (ø)
... and 2 more

... and 6 files with indirect coverage changes

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