Define TensorAlgebra.svd, define TensorAlgebra.qr rather than overloading LinearAlgebra.qr

[mtfishman]

Fixes #5.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.92%. Comparing base (4453f64) to head (6ddc169).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   91.66%   93.92%   +2.25%     
==========================================
  Files          16       15       -1     
  Lines         360      362       +2     
==========================================
+ Hits          330      340      +10     
+ Misses         30       22       -8     

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

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