Define orth and polar

[mtfishman]

As introduced in ITensor/TensorAlgebra.jl#52.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.69%. Comparing base (79fc797) to head (6818241).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #79   +/-   ##
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  Coverage   71.69%   71.69%           
=======================================
  Files          15       15           
  Lines         809      809           
=======================================
  Hits          580      580           
  Misses        229      229           

Flag	Coverage Δ
docs	28.28% <ø> (ø)

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