Fix WITs not playing nicely with wasm-tools etc.

wit/world.wit

@@ -1 +1,13 @@
-package spin:top-level;
+package fermyon:spin@3.0.0;
+
+/// The full world of a guest targeting an http-trigger
+world http-trigger {
+  include platform;
+  export wasi:http/incoming-handler@0.2.0;
+}
+
+/// The imports needed for a guest to run on a Spin host
+world platform {
+  include fermyon:spin/platform@2.0.0;
+  import wasi:config/store@0.2.0-draft-2024-09-27;
+}