feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/tests/runtime/async_functions/wasm.rs

@@ -0,0 +1,23 @@
+wit_bindgen_rust::import!("../../tests/runtime/async_functions/imports.wit");
+wit_bindgen_rust::export!("../../tests/runtime/async_functions/exports.wit");
+
+struct Exports;
+
+#[wit_bindgen_rust::async_trait(?Send)]
+impl exports::Exports for Exports {
+    fn allocated_bytes() -> u32 {
+        test_rust_wasm::get() as u32
+    }
+
+    async fn thunk() {
+        imports::thunk().await;
+    }
+
+    async fn test_concurrent() {
+        let a1 = imports::concurrent1(1);
+        let a2 = imports::concurrent2(2);
+        let a3 = imports::concurrent3(3);
+
+        assert_eq!(futures_util::join!(a2, a3, a1), (12, 13, 11));
+    }
+}