SwiftPM prebuilt libraries for faster project generation

Tuist can now use prebuilt libraries from Swift Package Manager dependencies when generating projects. This is especially useful for macro-heavy packages such as SwiftSyntax, where support libraries are large and expensive to build from source.

When a package provides prebuilt metadata, Tuist wires the generated project to the prebuilt library search paths, include paths, and linker flags instead of generating the corresponding source targets. Projects that depend on Swift macros can keep the same package workflow while avoiding unnecessary SwiftSyntax support builds in the generated Xcode project.

There is nothing new to configure for packages that expose the prebuilt metadata. Run tuist install and tuist generate as usual, and Tuist will use the available SwiftPM prebuilts during graph loading and project generation.