codify "platform" into resolution logic, server-fn/fullstack overhaul (#4596)

overhaul dioxus fullstack using a new implementation of server_fn

This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.

examples/01-app-demos/ecommerce-site/src/main.rs

@@ -0,0 +1,52 @@
+#![allow(non_snake_case)]
+
+use components::home::Home;
+use components::loading::ChildrenOrLoading;
+use dioxus::prelude::*;
+
+mod components {
+    pub mod error;
+    pub mod home;
+    pub mod loading;
+    pub mod nav;
+    pub mod product_item;
+    pub mod product_page;
+}
+mod api;
+
+fn main() {
+    dioxus::launch(|| {
+        rsx! {
+            document::Link {
+                rel: "stylesheet",
+                href: asset!("/public/tailwind.css")
+            }
+
+            ChildrenOrLoading {
+                Router::<Route> {}
+            }
+        }
+    });
+}
+
+#[derive(Clone, Routable, Debug, PartialEq)]
+enum Route {
+    #[route("/")]
+    Home {},
+
+    #[route("/details/:product_id")]
+    Details { product_id: usize },
+}
+
+#[component]
+/// Render a more sophisticated page with ssr
+fn Details(product_id: usize) -> Element {
+    rsx! {
+        div {
+            components::nav::Nav {}
+            components::product_page::ProductPage {
+                product_id
+            }
+        }
+    }
+}