move hot reloading utilities to dioxus repository

packages/rsx/src/hot_reload/hot_reloading_context.rs

@@ -0,0 +1,19 @@
+pub trait HotReloadingContext {
+    fn map_attribute(
+        element_name_rust: &str,
+        attribute_name_rust: &str,
+    ) -> Option<(&'static str, Option<&'static str>)>;
+    fn map_element(element_name_rust: &str) -> Option<(&'static str, Option<&'static str>)>;
+}
+
+pub struct Empty;
+
+impl HotReloadingContext for Empty {
+    fn map_attribute(_: &str, _: &str) -> Option<(&'static str, Option<&'static str>)> {
+        None
+    }
+
+    fn map_element(_: &str) -> Option<(&'static str, Option<&'static str>)> {
+        None
+    }
+}