Remove native and web features from dioxus-html (#3006)

* remove native and web features from dioxus-html

* Fix downcasting web events

* Fix desktop with tokio disabled

packages/web/src/events/file.rs

@@ -0,0 +1,24 @@
+use dioxus_html::HasFileData;
+
+use super::Synthetic;
+
+impl HasFileData for Synthetic<web_sys::Event> {
+    #[cfg(feature = "file_engine")]
+    fn files(&self) -> Option<std::sync::Arc<dyn dioxus_html::FileEngine>> {
+        use wasm_bindgen::JsCast;
+
+        let files = self
+            .event
+            .dyn_ref()
+            .and_then(|input: &web_sys::HtmlInputElement| {
+                input.files().and_then(|files| {
+                    #[allow(clippy::arc_with_non_send_sync)]
+                    crate::file_engine::WebFileEngine::new(files).map(|f| {
+                        std::sync::Arc::new(f) as std::sync::Arc<dyn dioxus_html::FileEngine>
+                    })
+                })
+            });
+
+        files
+    }
+}