Add first cut of C ABI creation / packaging

[timkpaine]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 82.35294% with 108 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.13%. Comparing base (698f6f2) to head (2ae7dab).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
hatch_rs/structs.py	78.13%	94 Missing ⚠️
hatch_rs/plugin.py	0.00%	8 Missing ⚠️
hatch_rs/tests/test_projects.py	91.66%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #52       +/-   ##
===========================================
+ Coverage   39.62%   80.13%   +40.51%     
===========================================
  Files           6        9        +3     
  Lines         212      735      +523     
===========================================
+ Hits           84      589      +505     
- Misses        128      146       +18     

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