Attempt to close #293

[thomvet]

• Simplified dispatch in factorization.jl
• Tests pass locally
• Also brought back cholesky! tests (needed a "don't alias" fix in basictests.jl)

[codecov[bot]]

Codecov Report

Merging #295 (31b6630) into main (a0bee73) will increase coverage by 0.32%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
+ Coverage   68.23%   68.56%   +0.32%     
==========================================
  Files          14       14              
  Lines         976      967       -9     
==========================================
- Hits          666      663       -3     
+ Misses        310      304       -6     

Impacted Files	Coverage Δ
src/factorization.jl	78.00% <ø> (+1.34%)	:arrow_up:

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