Add Tuist setup for XCFramework generation

[pepicrft]

Hey! I'm Pedro, co-founder of Tuist. I've been looking at OpenSwiftUI and thought it'd be useful to have a Tuist-based setup for producing XCFrameworks via xcodebuild, without relying solely on SPM.

This adds Tuist project manifests with a Project.swift covering all the existing targets (OpenSwiftUI, OpenSwiftUICore, OpenSwiftUI_SPI, COpenSwiftUI, OpenSwiftUIMacros, OpenSwiftUIExtension, OpenSwiftUIBridge, OpenSwiftUISymbolDualTestsSupport), a Tuist/Package.swift for external dependency resolution, and an availability-macros.xcconfig for the availability macro flags. I also added module maps for COpenSwiftUI and OpenSwiftUISymbolDualTestsSupport since Xcode needs them for module discovery, a package typealias in Path.swift to resolve an ORBPath ambiguity that arises from Xcode's transitive header search path propagation, and conditional compilation guards around BacklightServices-dependent code in the UIKit hosting views.

I've verified the build succeeds for macOS, iOS device, and iOS Simulator in both Debug and Release configurations, and successfully produced an XCFramework with xcodebuild -create-xcframework.

[Kyle-Ye]

I try to tuist install and tuist generate before the xcodebuild. And I'll fail on the tuist generate step (error msg: CoreUI.xcframework is missing). Would you mind updating the README to state to how to use it before xcodebuild (I assume it is tuist install and tuist generate here)

tuist generate
Loading and constructing the graph
It might take a while if the cache is empty


! Warning

  The following items may need attention:
   ▸ CoreUI.xcframework is missing architecture macos-arm64e-arm64-x86_64/CoreUI.framework/CoreUI defined in the Info.plist
   ▸ CoreUI.xcframework is missing architecture ios-arm64-arm64e/CoreUI.framework/CoreUI defined in the Info.plist
   ▸ CoreUI.xcframework is missing architecture ios-arm64-x86_64-simulator/CoreUI.framework/CoreUI defined in the Info.plist
   ▸ CoreUI.xcframework is missing architecture xros-arm64-x86_64-simulator/CoreUI.framework/CoreUI defined in the Info.plist


✖ Error
  Couldn't find any supported architecture references at /Users/kyle/Workspace/OpenSwiftUIProject/OpenSwiftUI/Tuist/.build/checkouts/DarwinPrivateFrameworks/CoreUI/2024/CoreUI.xcframework. It's possible that the .xcframework was not generated properly or that it got corrupted. Please, double check with the author of the framework.

  Sorry this didn’t work. Here’s what to try next:
   ▸ If the error is actionable, address it
   ▸ If the error is not actionable, let's discuss it in the [Troubleshooting & how to](https://community.tuist.dev/c/troubleshooting-how-to/6)
   ▸ If you are very certain it's a bug, [file an issue](https://github.com/tuist/tuist)
   ▸ Check out the logs at <redacted>

[Kyle-Ye]

Since there is no reply yet, I have created #838 instead.

[pepicrft]

@Kyle-Ye apologies for my delayed response. Turns out some business logic in Tuist didn't support .tbd files, causing the error that you just faced. Once we merge this we should be able to unblock this PR.

[Kyle-Ye]

apologies for my delayed response.

No worries at all on the timing.

I've verified the build succeeds for macOS, iOS device, and iOS Simulator in both Debug and Release configurations, and successfully produced an XCFramework with xcodebuild -create-xcframework.

I’m also a bit curious about the exact steps you used earlier, just to make sure we can reproduce the same setup reliably.