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/scripts/scrape_examples.rs

@@ -0,0 +1,48 @@
+use std::path::PathBuf;
+
+struct Example {
+    name: String,
+    path: PathBuf,
+}
+
+fn main() {
+    let dir = PathBuf::from("/Users/jonathankelley/Development/dioxus/examples");
+    let out_file = PathBuf::from("/Users/jonathankelley/Development/dioxus/target/decl.toml");
+
+    let mut out_items = vec![];
+
+    // Iterate through the sub-directories of the examples directory
+    for dir in dir.read_dir().unwrap().flatten() {
+        // For each sub-directory, walk it too, collecting .rs files
+        let Ok(dir) = dir.path().read_dir() else {
+            continue;
+        };
+
+        for dir in dir.flatten() {
+            let path = dir.path();
+            if path.extension().and_then(|s| s.to_str()) == Some("rs") {
+                let file_stem = path.file_stem().and_then(|s| s.to_str()).unwrap();
+                let workspace_path = path
+                    .strip_prefix("/Users/jonathankelley/Development/dioxus")
+                    .unwrap();
+                out_items.push(Example {
+                    name: file_stem.to_string(),
+                    path: workspace_path.to_path_buf(),
+                });
+            }
+        }
+    }
+
+    let mut out_toml = String::new();
+    out_items.sort_by(|a, b| a.path.cmp(&b.path));
+
+    for item in out_items {
+        out_toml.push_str(&format!(
+            "[[example]]\nname = \"{}\"\npath = \"{}\"\ndoc-scrape-examples = true\n\n",
+            item.name,
+            item.path.display()
+        ));
+    }
+
+    std::fs::write(out_file, out_toml).unwrap();
+}