WillDisplayUpgradeCallback typedef
        WillDisplayUpgradeCallback =
     void Function({String? appStoreVersion, required bool display, String? installedVersion, String? minAppVersion})
    
    
Signature of callback for willDisplayUpgrade. Includes display, minAppVersion, installedVersion, and appStoreVersion.
Implementation
typedef WillDisplayUpgradeCallback = void Function(
    {required bool display,
    String? minAppVersion,
    String? installedVersion,
    String? appStoreVersion});