feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/tests/codegen/async-functions.wit

@@ -0,0 +1,7 @@
+async-no-args: async func()
+async-args: async func(a: u32, b: string, c: list<string>)
+async-results: async func() -> tuple<u32, string, list<string>>
+
+resource async-resource {
+  frob: async func()
+}