Add support for starting a Live Activity with input-push-token on iOS 18

[ifrins]

Adds support for passing the input-push-token attribute, which is required in iOS 18 to start a Live Activity that wakes the app to get a push token to update the created Live Activity (which was not needed on iOS 17).

This has been tested with iOS 18.0 beta 6.

Apple docs: https://developer.apple.com/documentation/activitykit/starting-and-updating-live-activities-with-activitykit-push-notifications