Add SDKSource for XcodeKit

[navtoj]

The XcodeKit framework is located at the following path:

/Applications/Xcode.app/Contents/Developer/Library/Frameworks/XcodeKit.framework

This path is equivalent to $(DEVELOPER_DIR)/Library/Frameworks which is not covered by the current cases.

XcodeGraph/Sources/XcodeMetadata/Providers/SystemFrameworkMetadataProvider.swift

Lines 70 to 95 in 7922bd0

	private func sdkPath(name: String, platform: Platform, type: SDKType, source: SDKSource) throws -> AbsolutePath {
	switch source {
	case .developer:
	let xcodeDeveloperSdkRootPath = platform.xcodeDeveloperSdkRootPath
	let sdkRootPath = try AbsolutePath(validating: "/\(xcodeDeveloperSdkRootPath)")
	return sdkRootPath
	.appending(try RelativePath(validating: "Frameworks"))
	.appending(component: name)
	case .system:
	let sdkRootPath = try AbsolutePath(validating: "/\(platform.xcodeSdkRootPath)")
	switch type {
	case .framework:
	return sdkRootPath
	.appending(try RelativePath(validating: "System/Library/Frameworks"))
	.appending(component: name)
	case .library:
	return sdkRootPath
	.appending(try RelativePath(validating: "usr/lib"))
	.appending(component: name)
	case .swiftLibrary:
	return sdkRootPath
	.appending(components: "usr", "lib", "swift", name)
	}
	}
	}

Related: tuist/tuist#7973