Add abillity to control alert duration #68

It would be neat if it was possible to specify the duration of the the alert when presenting it. Right now the duration property is only available in the view, and not the AlertKitAPI wrapping class.

Context:

AlertKitAPI.present(
    title: "Oops",
    subtitle: error?.localizedDescription,
    icon: .error,
    style: .iOS17AppleMusic,
    haptic: .error
)