iOS and macOS: Host Python XCFramework and native Python dependencies on CocoaPods

[FeodorFitsner]

Kivy produces a bunch of *.xcframework files for Python and dependencies as well as install the dependency to site-packages.

XCFrameworks could be published to CocoaPods and then added as dependencies to serious_python project. Python part in site-packages could be packaged to wheels (.whl), published to GitHub and then installed with pip from a custom index.

Sources:

• https://anuragajwani.medium.com/distributing-universal-ios-frameworks-as-xcframeworks-using-cocoapods-699c70a5c961
• https://cocoapods.org/
• https://github.com/CocoaPods/Specs/blob/master/Specs/6/3/4/PythoniOSSupprt/3.9.0-b7/PythoniOSSupprt.podspec.json
• https://stackoverflow.com/questions/54349138/how-to-use-cocoapods-with-a-flutter-plugin
• https://docs.flutter.dev/packages-and-plugins/developing-packages#ios
• https://guides.cocoapods.org/syntax/podspec.html#dependency