Feature Request: Add Swift Package Manager (SPM) support to Adjust Flutter SDK

[kawapaso]

Hello Adjust Team,

I would like to use this SDK via the Swift Package Manager instead of CocoaPods,
because The CocoaPods team has publicly stated that CocoaPods is in maintenance mode.

References:

• https://blog.cocoapods.org/CocoaPods-Support-Plans
• https://docs.flutter.dev/packages-and-plugins/swift-package-manager/for-plugin-authors

Looking forward for your support here

Thanks,