Async support

[danielgafni]

It would be great to have async support like aiopath has.
Currently one needs to fallback to filesystem-specific libraries to write async code (as some of them support asynchronous=True).

[ap--]

Interesting! Yes that definitely sounds like a good addition.

I will checkout aiopath and think about how to best provide async methods for UPath.

It would be valuable to know if there are any issues with aiopath's design or if a similar implementation would provide everything that's needed.

[drernie]

I'm a huge fan of anyio for solving these issues (across aio and trio). v4 should be out shortly