Add oagBinary support

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR adds an option to consume OpenAttributeGraph as a prebuilt binary (xcframework) and restructures the SwiftPM manifest to make OpenAttributeGraphShims the default product.

Changes:

• Renamed internal targets to Platform and Utilities
• Made OpenAttributeGraphShims the only always-declared product/target, appending other targets/products conditionally
• Added OPENATTRIBUTESHIMS_OAG_USE_BINARY support to pull OpenAttributeGraph from a release xcframework
• Adjusted Compute binary env keys and wiring
• Moved swift-numerics to a conditional dependency (and updated the version) and updated Package.resolved accordingly

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[augmentcode]

Review completed. 2 suggestions posted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.08%. Comparing base (e9e235f) to head (76e602f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #215 +/- ##
=======================================
Coverage 32.08% 32.08% =======================================
Files 70 70 Lines 2596 2596 =======================================
Hits 833 833 Misses 1763 1763 

Flag	Coverage Δ
ios	32.10% <ø> (ø)
macos	9.95% <ø> (ø)
ubuntu	0.00% <ø> (ø)

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