Add no_leading_trailing_whitespace class, not working yet

[Ulthran]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 8 lines in your changes missing coverage. Please review.

Project coverage is 82.57%. Comparing base (196c825) to head (e23c6a9).

Files with missing lines	Patch %	Lines
app/metadatalib/src/metadatalib/utils.py	38.46%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   85.08%   82.57%   -2.52%     
==========================================
  Files           9        9              
  Lines         228      241      +13     
==========================================
+ Hits          194      199       +5     
- Misses         34       42       +8     

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