Replace usage of AssetsLibrary framework with PhotoKit on iOS

As mentioned in these issues starting with iOS 17 asset library urls are no longer accepted. Hence loading a QImage with an asset library url like this one fails :

assets-library://asset/asset.HEIC?id=0D2ADB24-6C3A-4704-A7FA-5789854EB627&ext=HEIC

https://bugreports.qt.io/browse/QTBUG-64074

https://bugreports.qt.io/browse/QTBUG-126438

The replacement is to use the iOS PhotoKit APIs. To work around the issue it is possible to extract the GUID of the asset url link and provide it to the photo kit API: https://developer.apple.com/documentation/photokit/phasset/1624732-fetchassetswithlocalidentifiers?language=objc

But ideally, we'd want all components including QML FileFolder/Qt QFileDialog to return the photokit compatible PHAsset local identifiers which can be provided to QImage to load that asset.