feat: make registered struct globals lua tables to enable method extension

[raphasampaio]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.85%. Comparing base (76e160c) to head (ba50730).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/macros.jl	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   62.27%   63.85%   +1.58%     
==========================================
  Files           9        9              
  Lines         766      783      +17     
==========================================
+ Hits          477      500      +23     
+ Misses        289      283       -6     

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