supernodal LDL wrapper

[goulart-paul]

Implements an optional wrapper for the faer-rs supernodal LDL solver.

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 87.45%. Comparing base (105b879) to head (4b95f6b).
Report is 1 commits behind head on develop.

❗ Current head 4b95f6b differs from pull request most recent head b4fc97c

Please upload reports for the commit b4fc97c to get more accurate results.

Files	Patch %	Lines
.../kktsolvers/direct/quasidef/ldlsolvers/faer_ldl.rs	97.91%	2 Missing ⚠️
src/qdldl/qdldl.rs	96.15%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #112      +/-   ##
===========================================
+ Coverage    87.24%   87.45%   +0.21%     
===========================================
  Files           75       76       +1     
  Lines         6011     6120     +109     
===========================================
+ Hits          5244     5352     +108     
- Misses         767      768       +1     

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