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/06-routing/flat_router.rs

@@ -0,0 +1,86 @@
+//! This example shows how to use the `Router` component to create a simple navigation system.
+//! The more complex router example uses all of the router features, while this simple example showcases
+//! just the `Layout` and `Route` features.
+//!
+//! Layouts let you wrap chunks of your app with a component. This is useful for things like a footers, heeaders, etc.
+//! Routes are enum variants with that match the name of a component in scope. This way you can create a new route
+//! in your app simply by adding the variant to the enum and creating a new component with the same name. You can
+//! override this of course.
+
+use dioxus::prelude::*;
+
+const STYLE: Asset = asset!("/examples/assets/flat_router.css");
+
+fn main() {
+    dioxus::launch(|| {
+        rsx! {
+            Stylesheet { href: STYLE }
+            Router::<Route> {}
+        }
+    })
+}
+
+#[derive(Routable, Clone)]
+#[rustfmt::skip]
+enum Route {
+    #[layout(Footer)] // wrap the entire app in a footer
+        #[route("/")]
+        Home {},
+
+        #[route("/games")]
+        Games {},
+
+        #[route("/play")]
+        Play {},
+
+        #[route("/settings")]
+        Settings {},
+}
+
+#[component]
+fn Footer() -> Element {
+    rsx! {
+        nav {
+            Link { to: Route::Home {}, class: "nav-btn", "Home" }
+            Link { to: Route::Games {}, class: "nav-btn", "Games" }
+            Link { to: Route::Play {}, class: "nav-btn", "Play" }
+            Link { to: Route::Settings {}, class: "nav-btn", "Settings" }
+        }
+        div { id: "content",
+            Outlet::<Route> {}
+        }
+    }
+}
+
+#[component]
+fn Home() -> Element {
+    rsx!(
+        h1 { "Home" }
+        p { "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua." }
+    )
+}
+
+#[component]
+fn Games() -> Element {
+    rsx!(
+        h1 { "Games" }
+        // Dummy text that talks about video games
+        p { "Lorem games are sit amet  Sed do eiusmod tempor et dolore magna aliqua." }
+    )
+}
+
+#[component]
+fn Play() -> Element {
+    rsx!(
+        h1 { "Play" }
+        p { "Always play with your full heart adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua." }
+    )
+}
+
+#[component]
+fn Settings() -> Element {
+    rsx!(
+        h1 { "Settings" }
+        p { "Settings are consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua." }
+    )
+}