Add precompiled iOS dependency preparation support

[sjchmiela]

Summary

• export precompiled modules helpers from @expo/build-tools and start preparation when flagged builds enable precompiled modules
• wait for precompiled module preparation before running pod install in both build-tools pod flows
• set worker env and config for precompiled module downloads, including proxy-aware download handling and coverage for the new behavior

Testing

[codecov]

Codecov Report

❌ Patch coverage is 92.77108% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.92%. Comparing base (7a4c81f) to head (77ef2ed).

Files with missing lines	Patch %	Lines
...ckages/build-tools/src/utils/precompiledModules.ts	91.55%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3556      +/-   ##
==========================================
+ Coverage   53.80%   53.92%   +0.13%     
==========================================
  Files         820      822       +2     
  Lines       34978    35076      +98     
  Branches     7217     7229      +12     
==========================================
+ Hits        18815    18911      +96     
- Misses      16072    16078       +6     
+ Partials       91       87       -4     

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File Patterns	Mentions
**/*	@douglowder

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[chrfalch]

I’m not yet experienced with the build tools, but I’ve gone through the PR and as far as i can see it looks good. This is also a test for supporting precompiled frameworks on iOS in EAS build so there will definitely be room for some improvements when we get decent packaging and versioning of these modules.