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/08-apis/title.rs

@@ -0,0 +1,22 @@
+//! This example shows how to set the title of the page or window with the Title component
+
+use dioxus::prelude::*;
+
+fn main() {
+    dioxus::launch(app);
+}
+
+fn app() -> Element {
+    let mut count = use_signal(|| 0);
+
+    rsx! {
+        div {
+            // You can set the title of the page with the Title component
+            // In web applications, this sets the title in the head.
+            // On desktop, it sets the window title
+            Title { "My Application (Count {count})" }
+            button { onclick: move |_| count += 1, "Up high!" }
+            button { onclick: move |_| count -= 1, "Down low!" }
+        }
+    }
+}