Async support?

[znd4]

I have no idea how much work would be required to implement this, but it'd be awesome to be able to

await Repo.clone_from(url, path)

(or something similar -- it's not the end of the world if it has to be a separate method):

await Repo.async_clone_from(url, path)

I just read the blurb about the status of this project, so totally get that this would only be unlikely to be implemented without an enterprising contributor.

I googled my way to asyncio.create_subprocess_exec, so it's definitely possible, but it seems like it'd be a ton of work to maintain async and non-async interfaces for everything, so I could understand if you'd rather not accept this as a contribution