[New Generator] Rust API client generator (#6092)

* Added rust client example

* Added a proper apiclient / configuration based example

samples/client/petstore/rust/examples/client.rs

@@ -0,0 +1,48 @@
+extern crate petstore_client;
+extern crate hyper;
+extern crate tokio_core;
+extern crate futures;
+
+use hyper::Client;
+use hyper::client::HttpConnector;
+use tokio_core::reactor::Core;
+use futures::{Future};
+
+fn main() {
+    let mut core = Core::new().expect("failed to init core");
+    let handle = core.handle();
+
+    let http_connector = HttpConnector::new(4, &handle);
+
+    let client = Client::configure().connector(http_connector).build(&handle);
+    let api = "http://petstore.swagger.io:80/v2";
+
+    let new_pet = petstore_client::models::Pet::new("barker".to_owned(), vec![]).with_id(1337);
+
+    let apicli = petstore_client::apis::client::APIClient::new(
+        petstore_client::apis::configuration::Configuration::new(
+            Client::configure().connector(HttpConnector::new(4, &handle)).build(&handle)));
+
+    let work = apicli.pet_api().add_pet(&new_pet)
+    // petstore_client::apis::add_pet(api, &client, &new_pet)
+    .and_then(|_| {
+        petstore_client::apis::update_pet_with_form(
+            api,
+            &client,
+            1337,
+            "barko",
+            "escaped")
+    })
+    .and_then(|_| {
+        petstore_client::apis::get_pet_by_id(
+            api,
+            &client,
+            1337)
+    })
+    .and_then(|pet| {
+        println!("pet: {:?}", pet);
+        futures::future::ok(())
+    });
+
+    core.run(work).expect("failed to run core");
+}