refined hessian sparsity detection

[blegat]

Applies refined hessian sparsity implemented by @mlubin in jump-dev/MathOptInterface.jl#2882

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.70%. Comparing base (68dbc68) to head (b0f88a2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   90.65%   90.70%   +0.05%     
==========================================
  Files          16       16              
  Lines        2258     2271      +13     
==========================================
+ Hits         2047     2060      +13     
  Misses        211      211              

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