Allow access to model in solving stage in plugins

[mmghannam]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.68%. Comparing base (9f0164c) to head (b95db9d).
Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scip.rs	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
+ Coverage   76.74%   77.68%   +0.95%     
==========================================
  Files          14       16       +2     
  Lines        1973     2236     +263     
==========================================
+ Hits         1514     1737     +223     
- Misses        459      499      +40     

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