Fixed build error: 'cannot find PersistenceController in scope'
Changes:
- Made PersistenceController class public
- Made shared static property public
- Made container property public
- Made init method public
This allows DailyNotificationPlugin to access PersistenceController
across module boundaries. CocoaPods pod install was required to
regenerate project files with updated access modifiers.
Result: iOS plugin now builds successfully
530691b863