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/logging.rs

@@ -0,0 +1,53 @@
+//! Dioxus ships out-of-the-box with tracing hooks that integrate with the Dioxus-CLI.
+//!
+//! The built-in tracing-subscriber automatically sets up a wasm panic hook and wires up output
+//! to be consumed in a machine-readable format when running under `dx`.
+//!
+//! You can disable the built-in tracing-subscriber or customize the log level yourself.
+//!
+//! By default:
+//! - in `dev` mode, the default log output is `debug`
+//! - in `release` mode, the default log output is `info`
+//!
+//! To use the dioxus logger in your app, simply call any of the tracing functions (info!(), warn!(), error!())
+
+use dioxus::logger::tracing::{Level, debug, error, info, warn};
+use dioxus::prelude::*;
+
+fn main() {
+    // `dioxus::logger::init` is optional and called automatically by `dioxus::launch`.
+    // In development mode, the `Debug` tracing level is set, and in release only the `Info` level is set.
+    // You can call it yourself manually in the cases you:
+    //   - want to customize behavior
+    //   - aren't using `dioxus::launch` (i.e. custom fullstack setups) but want the integration.
+    // The Tracing crate is the logging interface that the dioxus-logger uses.
+    dioxus::logger::init(Level::INFO).expect("Failed to initialize logger");
+    dioxus::launch(app);
+}
+
+fn app() -> Element {
+    rsx! {
+        div {
+            h1 { "Logger demo" }
+            button {
+                onclick: move |_| warn!("Here's a warning!"),
+                "Warn!"
+            }
+            button {
+                onclick: move |_| error!("Here's an error!"),
+                "Error!"
+            }
+            button {
+                onclick: move |_| {
+                    debug!("Here's a debug");
+                    warn!("The log level is set to info so there should not be a debug message")
+                },
+                "Debug!"
+            }
+            button {
+                onclick: move |_| info!("Here's an info!"),
+                "Info!"
+            }
+        }
+    }
+}