Supervisor for running an animation with an asynchronous function.

    Args:
        func: A function to be run alongside an animation.
        animation_: An infinite generator that produces
        strings for the animation.
        step: Seconds between each animation frame.
        *args: Arguments for func.
        **kwargs: Keyword arguments for func.
    Returns:
        The result of func(*args, **kwargs)
    Raises:
        Any exception that is thrown when executing func.

async def _async_supervisor(func, animation_, step, *args, **kwargs):
    """Supervisor for running an animation with an asynchronous function.

    Args:
        func: A function to be run alongside an animation.
        animation_: An infinite generator that produces
        strings for the animation.
        step: Seconds between each animation frame.
        *args: Arguments for func.
        **kwargs: Keyword arguments for func.
    Returns:
        The result of func(*args, **kwargs)
    Raises:
        Any exception that is thrown when executing func.
    """
    with ThreadPoolExecutor(max_workers=2) as pool:
        with _terminating_event() as event:
            pool.submit(animate_cli, animation_, step, event)
            result = await func(*args, **kwargs)
    return result