Faster DEModel._get_unique_root

[dweindl]

More efficient equality check:

• Check equality before simplification
• Respect DEModel._simplify for simplification

This makes a very noticable difference for some models.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.39%. Comparing base (1e8cf9c) to head (a4eb11b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3024      +/-   ##
==========================================
- Coverage   78.01%   77.39%   -0.62%     
==========================================
  Files         311      311              
  Lines       20584    20584              
  Branches     1499     1499              
==========================================
- Hits        16059    15932     -127     
- Misses       4515     4642     +127     
  Partials       10       10              

Flag	Coverage Δ
cpp	70.32% <100.00%> (+0.01%)	⬆️
cpp_python	36.74% <100.00%> (ø)
petab	45.71% <100.00%> (ø)
petab_sciml	13.65% <0.00%> (ø)
python	69.33% <100.00%> (+<0.01%)	⬆️
sbmlsuite-jax	?

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

Files with missing lines	Coverage Δ
python/sdist/amici/de_model.py	92.12% <100.00%> (-0.39%)	⬇️

... and 8 files with indirect coverage changes

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