Add Compute graph debug shims for non-Darwin platforms

[Kyle-Ye]

Summary

• Expose Compute graph debug APIs on non-Darwin platforms so downstream packages can compile shared call sites.
• Use no-op implementations for printing and JSON archival, and return empty graph and stack descriptions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.17%. Comparing base (480e30e) to head (01faf1d).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   32.17%   32.17%           
=======================================
  Files          71       71           
  Lines        2601     2601           
=======================================
  Hits          837      837           
  Misses       1764     1764           

Flag	Coverage Δ
ios	32.19% <ø> (ø)
macos	10.15% <ø> (ø)
ubuntu	12.03% <ø> (ø)

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[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenAttributeGraph-Package	✅	0 %	90	0	90	71ca80ae3

Builds 🔨

Scheme	Status	Duration	Commit
OpenAttributeGraph	✅	37.4s	71ca80ae3
OpenAttributeGraph-Package	✅	41.4s	71ca80ae3