Making it easier to duplicate and later factor.
-- v2: windows.security.credentials.ui.userconsentverifier: Sync async impl with windows.gaming.input. windows.devices.enumeration: Sync async impl with windows.gaming.input. cryptowinrt: Sync async impl with windows.gaming.input. windows.media.speech: Sync async impl with windows.gaming.input. windows.gaming.input: Move async impl interfaces to a dedicated IDL.