Refactored u16 to use the BlockExt trait

[tcoratger]

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.72727% with 12 lines in your changes missing coverage. Please review.

Project coverage is 91.61%. Comparing base (b2f1568) to head (afebc44).
Report is 11 commits behind head on main.

❗ Current head afebc44 differs from pull request most recent head 66e8d4a

Please upload reports for the commit 66e8d4a to get more accurate results.

Files	Patch %	Lines
src/libfuncs/uint16.rs	92.72%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #668      +/-   ##
==========================================
- Coverage   91.95%   91.61%   -0.35%     
==========================================
  Files         112      115       +3     
  Lines       34265    34554     +289     
==========================================
+ Hits        31509    31656     +147     
- Misses       2756     2898     +142     

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