Add QR

[mtao]

Adds SuiteSparse::SPQR and Eigen::SparseQR support

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.04%. Comparing base (68aacce) to head (7bdb3eb).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/polysolve/linear/Solver.cpp	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   81.22%   82.04%   +0.81%     
==========================================
  Files          49       49              
  Lines        2008     2205     +197     
  Branches      268      269       +1     
==========================================
+ Hits         1631     1809     +178     
- Misses        377      396      +19     

Flag	Coverage Δ
polysolve	82.04% <91.66%> (+0.81%)	⬆️

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