Special cases for FillArrays.Eye, fix MatrixAlgebraKit factorizations

[mtfishman]

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[codecov]

Codecov Report

Attention: Patch coverage is 26.21359% with 76 lines in your changes missing coverage. Please review.

Project coverage is 50.49%. Comparing base (d3de597) to head (e85b21a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/KroneckerArrays.jl	26.21%	76 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   60.00%   50.49%   -9.51%     
==========================================
  Files           1        1              
  Lines         230      305      +75     
==========================================
+ Hits          138      154      +16     
- Misses         92      151      +59     

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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