Add Swift Package Manager support

[Clancey]

• Add Package.swift configuration for SPM
• Reference existing XCFrameworks from Pods directory
• Create StarPRNTSDK wrapper module for clean imports
• Update README with SPM installation instructions
• Add .gitignore for SPM build artifacts

Users can now add the SDK via Swift Package Manager using the GitHub URL.

[audeatluci]

Hi team 👋 — quick question: can this be merged? We could really use this functionality for our project, and merging it would help us immensely

Thanks in advance!

[KHosozawa]

@Clancey
CC: @audeatluci

Thank you for your proposal. We apologize for the delayed response.

After discussing SPM support internally, we have determined that due to resource constraints it is not feasible to proceed at this time. For now, we will provide support for CocoaPods only. We apologize for not meeting expectations, and we appreciate your understanding.

[Clancey]

Resource constraint? The work is done 🤷

[KHosozawa]

@Clancey
Thank you for your suggestion to add SPM support to our CocoaPods-focused codebase. While we appreciate the effort, we currently do not have the resources to implement and maintain dual support for CocoaPods and SPM. Therefore, we will continue to focus on CocoaPods for now. We appreciate your understanding, and we will share any updates if our plans change.