define LinearAlgebra.normalize

[ogauthe]

This PR defines LinearAlgebra.normalize and LinearAlgebra.normalize! for a FusionTensor. Also removes some filled code.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.05%. Comparing base (98c5fd9) to head (a493f75).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
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+ Coverage   91.33%   93.05%   +1.71%     
==========================================
  Files          11       11              
  Lines         612      605       -7     
==========================================
+ Hits          559      563       +4     
+ Misses         53       42      -11     

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[mtfishman]

Oh I see, I guess only 2-norm of FusionTensor is defined right now. I think p-norm shouldn't be too hard to define, right? I think that would be useful since we might want to truncate according to different norms, say if we are truncating a density matrix using an eigendecomposition and want to use a 1-norm. Then it would be helpful to be able to compute the truncation error using norm(ft - u * d * u', 1).