chore: Reorganize examples and interop crates (#180)

* chore: Reorganize examples and interop crates

* fix interop tests

examples/src/multiplex/client.rs

@@ -0,0 +1,39 @@
+pub mod hello_world {
+    tonic::include_proto!("helloworld");
+}
+
+pub mod echo {
+    tonic::include_proto!("grpc.examples.echo");
+}
+
+use echo::{echo_client::EchoClient, EchoRequest};
+use hello_world::{greeter_client::GreeterClient, HelloRequest};
+use tonic::transport::Endpoint;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let channel = Endpoint::from_static("http://[::1]:50051")
+        .connect()
+        .await?;
+
+    let mut greeter_client = GreeterClient::new(channel.clone());
+    let mut echo_client = EchoClient::new(channel);
+
+    let request = tonic::Request::new(HelloRequest {
+        name: "Tonic".into(),
+    });
+
+    let response = greeter_client.say_hello(request).await?;
+
+    println!("GREETER RESPONSE={:?}", response);
+
+    let request = tonic::Request::new(EchoRequest {
+        message: "hello".into(),
+    });
+
+    let response = echo_client.unary_echo(request).await?;
+
+    println!("ECHO RESPONSE={:?}", response);
+
+    Ok(())
+}