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/hotdog/Dioxus.toml

@@ -0,0 +1,8 @@
+[application]
+
+# App (Project) Name
+name = "hot_dog"
+
+[bundle]
+identifier = "com.dioxuslabs"
+publisher = "Dioxus Labs"