feat: support unix socket tunnel (for ios) (#1779)

Co-authored-by: Page Chen <pagechen04@gmail.com>

easytier/src/connector/mod.rs

@@ -7,6 +7,8 @@ use http_connector::HttpTunnelConnector;
 
 #[cfg(feature = "quic")]
 use crate::tunnel::quic::QUICTunnelConnector;
+#[cfg(unix)]
+use crate::tunnel::unix::UnixSocketTunnelConnector;
 #[cfg(feature = "wireguard")]
 use crate::tunnel::wireguard::{WgConfig, WgTunnelConnector};
 use crate::{
@@ -177,6 +179,11 @@ pub async fn create_connector_by_url(
             }
             Box::new(connector)
         }
+        #[cfg(unix)]
+        "unix" => {
+            let connector = UnixSocketTunnelConnector::new(url);
+            Box::new(connector)
+        }
         _ => {
             return Err(Error::InvalidUrl(url.into()));
         }