tunnel(bind): gather all bind logic to a single function (#2070)

* extract a Bindable trait for binding TcpSocket, TcpListener, and UdpSocket

easytier/Cargo.toml

@@ -242,6 +242,7 @@ hickory-server = { version = "0.25.2", features = [
     "resolver",
 ], optional = true }
 
+bon = "3.9.1"
 derive_builder = "0.20.2"
 humantime-serde = "1.1.1"
 multimap = "0.10.1"