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.

packages/interpreter/src/ts/form.ts

@@ -35,6 +35,11 @@ export function retrieveFormValues(form: HTMLFormElement): FormValues {
   const formData = new FormData(form);
   const contents: { [key: string]: FormDataEntryValue[] } = {};
   formData.forEach((value, key) => {
+    if (value instanceof File) {
+      contents[key] = [value.name];
+      return;
+    }
+
     if (contents[key]) {
       contents[key].push(value);
     } else {