Add missing xcframework properties

[rkistner]

Reported issue when submitting to App Store / TestFlight:

[logs] ERROR: [ContentDelivery.Uploader] Asset validation failed (90530) Invalid MinimumOSVersion. Apps that only support 64-bit devices must specify a deployment target of 8.0 or later. MinimumOSVersion in 'abc.app/Frameworks/powersync-sqlite-core.framework' is ''.
[logs] ERROR: [ContentDelivery.Uploader] Asset validation failed (90360) Missing Info.plist value. A value for the key 'MinimumOSVersion' in bundle abc.app/Frameworks/powersync-sqlite-core.framework is required.
[logs] ERROR: [ContentDelivery.Uploader] Asset validation failed (90057) The bundle 'Payload/abc.app/Frameworks/powersync-sqlite-core.framework' is missing plist key. The Info.plist file is missing the required key: CFBundleShortVersionString. Please find more information about CFBundleShortVersionString at https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleshortversionstring
[logs] ERROR: [ContentDelivery.Uploader] Asset validation failed (90056) This bundle Payload/abc.app/Frameworks/powersync-sqlite-core.framework is invalid. The Info.plist file is missing the required key: CFBundleVersion. Please find more information about CFBundleVersion at https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleversion
[logs] ERROR: [ContentDelivery.Uploader] Asset validation failed (90208) Invalid Bundle. The bundle abc.app/Frameworks/powersync-sqlite-core.framework does not support the minimum OS Version specified in the Info.plist.

Fixes #4.

Also fixes a couple of release-related issues.