Use FusionStyle in tensor factorizations and functions

[mtfishman]

Also start using [workspace] in Project.toml.

[codecov]

Codecov Report

❌ Patch coverage is 70.90909% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.09%. Comparing base (14fa276) to head (cbbfea9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/factorizations.jl	80.48%	8 Missing ⚠️
src/matrixfunctions.jl	42.85%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   87.88%   86.09%   -1.80%     
==========================================
  Files          17       17              
  Lines         644      676      +32     
==========================================
+ Hits          566      582      +16     
- Misses         78       94      +16     

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

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