Add easy connect method in codegen

tonic-examples/src/helloworld/client.rs

@@ -1,5 +1,3 @@
-use tonic::transport::Channel;
-
 pub mod hello_world {
     include!(concat!(env!("OUT_DIR"), "/helloworld.rs"));
 }
@@ -8,11 +6,7 @@ use hello_world::{client::GreeterClient, HelloRequest};
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let origin = vec![http::Uri::from_static("http://[::1]:50051").into()];
-
-    let svc = Channel::builder().balance_list(origin)?;
-
-    let mut client = GreeterClient::new(svc);
+    let mut client = GreeterClient::connect("http://[::1]:50051")?;
 
     let request = tonic::Request::new(HelloRequest {
         name: "hello".into(),