Prerequisites:

• [tool] Enable Swift Package Manager by default on master release channel flutter#151567

The following documentation needs to be updated to use SwiftPM instead of CocoaPods once SwiftPM is the default:

• https://docs.flutter.dev/packages-and-plugins/developing-packages
• https://docs.flutter.dev/get-started/flutter-for/uikit-devs#managing-dependencies
• https://docs.flutter.dev/platform-integration/ios/ios-app-clip#step-8-integrate-plugins
• https://docs.flutter.dev/platform-integration/ios/app-extensions (see Why are there no libraries (pods) in iOS target (extension)? flutter#142136)