add binder for connector

pkg/connector/socks/v5/conn.go

@@ -0,0 +1,17 @@
+package v5
+
+import "net"
+
+type bindConn struct {
+	net.Conn
+	localAddr  net.Addr
+	remoteAddr net.Addr
+}
+
+func (c *bindConn) LocalAddr() net.Addr {
+	return c.localAddr
+}
+
+func (c *bindConn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}