Forward unix domain socket from the host into the guest

### Description

```
portForwards:
- guestSocket: "/foo/test.sock"
hostSocket: "/Users/me/tmp/test.sock"
```

I was trying to do something like this only to realize it works the opposite direction I need. Is there a way to forward FROM host TO the guest?

Also, with 9p - will unix sockets just work via mounts without extra forwarding?