sc-8814: Create dummy Xcode app projects to test CocoaPods, Carthage, and Swift Package Manager distributions

[jrtibbetts]

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[sc-8814] [iOS SDK] Create dummy Xcode app projects to test CocoaPods, Carthage, and Swift Package Manager distributions

• Adds 6 dummy Xcode app projects to a subfolder. Each one simply displays its name and the SDK version that it uses. Note: The Swift Package Manager ones currently display 1.0, because I haven't figured out how to set the MARKETING_VERSION on a Swift package, or whether that's even possible.

There are a bajillion files in this PR, but not much to review: they're just default Xcode projects with minor changes to the Main.storyboard and ViewController.[swift|h|m]. There's a lot of copied & pasted code, too, because Xcode doesn't like having source files in a top-level shared folder outside of the project folder.

Sample screenshot:

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #8814: [iOS SDK] Create dummy Xcode app projects to test CocoaPods, Carthage, and Swift Package Manager distributions.