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/load.rs

@@ -0,0 +1,37 @@
+use std::any::Any;
+
+use dioxus_html::HasImageData;
+use web_sys::Event;
+
+use super::WebEventExt;
+
+#[derive(Clone)]
+pub(crate) struct WebImageEvent {
+    raw: Event,
+    error: bool,
+}
+
+impl WebImageEvent {
+    pub fn new(raw: Event, error: bool) -> Self {
+        Self { raw, error }
+    }
+}
+
+impl HasImageData for WebImageEvent {
+    fn load_error(&self) -> bool {
+        self.error
+    }
+
+    fn as_any(&self) -> &dyn Any {
+        &self.raw as &dyn Any
+    }
+}
+
+impl WebEventExt for dioxus_html::ImageData {
+    type WebEvent = Event;
+
+    #[inline(always)]
+    fn try_as_web_event(&self) -> Option<Event> {
+        self.downcast::<WebImageEvent>().map(|e| e.raw.clone())
+    }
+}