Move asyncio thread decorator to a common file and import it

[ControlxFreak]

I think it would be good to run the gif saving in a non-blocking thread as well so this can be reused.

def to_thread(func: Callable) -> Coroutine:
    """Helper to make these blocking functions cast to threads since they are really slow and cause Discord to freak out."""
    @functools.wraps(func)
    async def wrapper(*args, **kwargs):
        return await asyncio.to_thread(func, *args, **kwargs)
    return wrapper

[ControlxFreak]

I think it has been optimized enough. Things are relatively fast now