Add model.clear and remove setters

[NicolaCourtier]

Description

Fixes unintended consequences of ruff linting.

Issue reference

Fixes #445

Review

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.53%. Comparing base (d68a70d) to head (605f509).
Report is 494 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #448      +/-   ##
===========================================
+ Coverage    98.51%   98.53%   +0.02%     
===========================================
  Files           46       46              
  Lines         2960     2941      -19     
===========================================
- Hits          2916     2898      -18     
+ Misses          44       43       -1     

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[BradyPlanden]

LGTM, just one comment on the solver setter.