[iOS] Add Swift Package Manager support #64
Description
It would be great if this package supported Swift Package Manager (SPM) as an alternative to CocoaPods. This would help projects that are moving away from CocoaPods due to dependency management issues and provide a more native approach for integrating iOS dependencies.
Flutter will eventually deprecate and then remove support for CocoaPods. Adding Swift Package Manager support future-proofs your plugin.
Thank you!