Implemented norm for scalars.

[benedict-96]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.72%. Comparing base (df54388) to head (00b9cc7).

Files with missing lines	Patch %	Lines
src/utils/norms.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   77.91%   77.72%   -0.19%     
==========================================
  Files          19       19              
  Lines         412      413       +1     
==========================================
  Hits          321      321              
- Misses         91       92       +1     

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