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/02-building-ui/disabled.rs

@@ -0,0 +1,25 @@
+//! A simple demonstration of how to set attributes on buttons to disable them.
+//!
+//! This example also showcases the shorthand syntax for attributes, and how signals themselves implement IntoAttribute
+
+use dioxus::prelude::*;
+
+fn main() {
+    dioxus::launch(app);
+}
+
+fn app() -> Element {
+    let mut disabled = use_signal(|| false);
+
+    rsx! {
+        div { text_align: "center", margin: "20px", display: "flex", flex_direction: "column", align_items: "center",
+            button {
+                onclick: move |_| disabled.toggle(),
+                "click to "
+                if disabled() { "enable" } else { "disable" }
+                " the lower button"
+            }
+            button { disabled, "lower button" }
+        }
+    }
+}