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

### Prerequisites

- [x] This is not a Security Disclosure, otherwise please follow the guidelines in [Security Policy](https://github.com/adobe/aepsdk-flutter/security/policy).
- [x] I have searched in this repository's issues to see if it has already been reported.

### Feature request summary

Hello Adobe aepsdk-flutter Team,

I would like to use this SDKs 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,

### Current behavior

_No response_

### Expected behavior

_No response_

### Additional implementation details or code snippets

_No response_

Start with the Flutter plugin authors' Swift Package Manager guide linked in the issue, then inspect this repository's iOS package configuration. The issue names no files, tests, or entry point and provides no expected behavior, so the required configuration changes and completion checks must be clarified before implementation.

Written by the indexing model from the issue text.