WIP: Use only FoundationEssentials

[t089]

Copies over some bits and pieces from FoundationEssentials itself. Just wanted to make it build.

[codecov]

Codecov Report

❌ Patch coverage is 63.57616% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.71%. Comparing base (445ce27) to head (37a0b92).
⚠️ Report is 73 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/SotoUtils/String+Utils.swift	62.32%	55 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #628      +/-   ##
==========================================
- Coverage   80.54%   79.71%   -0.83%     
==========================================
  Files          78       79       +1     
  Lines        6575     6819     +244     
==========================================
+ Hits         5296     5436     +140     
- Misses       1279     1383     +104     

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