Hessian oracle

[jajhall]

This allows the QP active set solve (and shortly HiPO) to operate using an oracle for the Hessian $$Q$$. This oracle must be able to compute $$Qx$$, but there is greater efficiency if it can supply a column of the Hessian.

[codecov]

Codecov Report

❌ Patch coverage is 91.30817% with 99 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.18%. Comparing base (8985537) to head (403e18a).
⚠️ Report is 80 commits behind head on latest.

Files with missing lines	Patch %	Lines
highs/model/HighsHessian.cpp	79.86%	59 Missing ⚠️
highs/lp_data/Highs.cpp	86.76%	18 Missing ⚠️
highs/qpsolver/matrix.hpp	96.12%	6 Missing ⚠️
check/TestQpOracle.cpp	98.71%	5 Missing ⚠️
highs/io/HMPSIO.cpp	66.66%	3 Missing ⚠️
highs/lp_data/HighsInterface.cpp	60.00%	2 Missing ⚠️
highs/qpsolver/feasibility_bounded.hpp	96.82%	2 Missing ⚠️
highs/qpsolver/scaling.cpp	0.00%	2 Missing ⚠️
highs/lp_data/HighsOptions.h	75.00%	1 Missing ⚠️
highs/qpsolver/a_quass.cpp	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #3153      +/-   ##
==========================================
- Coverage   73.19%   73.18%   -0.02%     
==========================================
  Files         430      432       +2     
  Lines      104154   105408    +1254     
  Branches    16738    16967     +229     
==========================================
+ Hits        76239    77146     +907     
- Misses      27639    27986     +347     
  Partials      276      276              

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