Faster substitutions with smart_subs_dict

[dweindl]

• Disable evaluation during substitution
• Use xreplace instead of subs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.40%. Comparing base (319efac) to head (eada362).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3025      +/-   ##
==========================================
- Coverage   78.03%   77.40%   -0.64%     
==========================================
  Files         311      311              
  Lines       20584    20587       +3     
  Branches     1499     1499              
==========================================
- Hits        16063    15935     -128     
- Misses       4511     4642     +131     
  Partials       10       10              

Flag	Coverage Δ
cpp	70.33% <100.00%> (+<0.01%)	⬆️
cpp_python	36.75% <100.00%> (+<0.01%)	⬆️
petab	45.72% <85.71%> (+<0.01%)	⬆️
petab_sciml	13.66% <71.42%> (+<0.01%)	⬆️
python	69.33% <100.00%> (+<0.01%)	⬆️
sbmlsuite-jax	?

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Files with missing lines	Coverage Δ
python/sdist/amici/importers/utils.py	82.03% <100.00%> (-2.70%)	⬇️

... and 5 files with indirect coverage changes

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[dweindl]

For my current benchmark, this reduces the time for one smart_subs_dict call from over 21h (still running...) to ~12min.

Disabling evaluation during substitution may prevent simplification of some expressions during substitution, but those can be simplified later on.