Add MatrixAlgebraKit factorizations for (scaled) deltas

[mtfishman]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 94.49541% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.57%. Comparing base (f6a66da) to head (d4ea97a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...AlgebraKitExt/DiagonalArraysMatrixAlgebraKitExt.jl	93.68%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   88.36%   90.57%   +2.21%     
==========================================
  Files          11       14       +3     
  Lines         275      382     +107     
==========================================
+ Hits          243      346     +103     
- Misses         32       36       +4     

Flag	Coverage Δ
docs	28.38% <0.00%> (-10.96%)	⬇️

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