Experimental MAS PCG solver

[iiiian]

Tested on cuda 13 only.

Compile

Pass -DPOLYSOLVE_WITH_CUDA=1 during configuration.

Important json para

"block_dim"          -> Use 1 for scalar problem, 2 for 2d problem, 3 for 3d problem.
"relative_tolerance" -> Relative residual
"absolute_tolerance" -> Absolute residual

Logging

Top enable timing break down, replace SPDLOG_TRACE with SPDLOG_INFO in source.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.52%. Comparing base (19cc8ec) to head (f03c436).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   80.50%   80.52%   +0.01%     
==========================================
  Files          49       49              
  Lines        2119     2121       +2     
  Branches      283      284       +1     
==========================================
+ Hits         1706     1708       +2     
  Misses        413      413              

Flag	Coverage Δ
polysolve	80.52% <100.00%> (+0.01%)	⬆️

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