Actually add the privacy manifest to app resource bundle

[onevcat]

This allows Xcode to generate read and generate the report based on Kingfisher's privacy manifest

Although for now, it only reads the "collecting data" section and Kingfisher does not has one, so there should be no actual affect to the app project. But I can verify the relate file are already under the correct place and be checked by Xcode 15. So in future, if Xcode decides to also generate the report for NSPrivacyAccessedAPITypes one day, there should be no additional work required in Kingfisher side.

Ref: #2122 #2155