Add some UnixStream support on Windows
At this point, all the Rust eco-system is lacking UDS Windows support.
- https://github.com/retep998/winapi-rs/pull/968
- https://github.com/rust-lang/socket2/pull/249
- https://github.com/rust-lang/rust/issues/56533
- mio (no issue yet?)
- https://github.com/tokio-rs/tokio/issues/2201
I suppose async-std will just work once it's in std.
So we just rely on https://crates.io/crates/uds_windows for now.