impl(auth): trust boundaries module

[alvarowolfx]

Towards #4186

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.02%. Comparing base (b7e90c7) to head (8b07bbf).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/auth/src/access_boundary.rs	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4346      +/-   ##
==========================================
- Coverage   95.03%   95.02%   -0.02%     
==========================================
  Files         199      199              
  Lines        7772     7795      +23     
==========================================
+ Hits         7386     7407      +21     
- Misses        386      388       +2     

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