Add LiveKit cloud auth to krisp viva plugin

[lukasIO]

simplified default usage for cloud users now looks like

  await session.start(
        agent=MyAgent(),
        room=ctx.room,
        room_options=room_io.RoomOptions(
            audio_input=room_io.AudioInputOptions(
                noise_cancellation=krisp.KrispVivaFilterFrameProcessor(noise_suppression_level=90)
            ),
        ),
    )