feat(grpc): Add basic grpc example

src/grpc/client.rs

@@ -0,0 +1,33 @@
+use super::hello_world;
+
+use hello_world::greater_client::GreaterClient;
+use hello_world::HelloRequest;
+use tonic::async_trait;
+
+#[derive(Debug, Default)]
+pub struct GRPCClient {
+    address: String,
+}
+
+impl GRPCClient {
+    pub fn new(address: String) -> Self {
+        Self { address }
+    }
+}
+
+#[async_trait]
+impl super::Connection for GRPCClient {
+    async fn connect(&self) -> Result<(), Box<dyn std::error::Error>> {
+        let mut client = GreaterClient::connect(format!("http://{}", self.address)).await?;
+
+        let request = tonic::Request::new(HelloRequest {
+            name: "Self".into(),
+        });
+
+        let response = client.say_hello(request).await?;
+
+        println!("RESPONSE={:?}", response);
+
+        Ok(())
+    }
+}