On Orbital, implement KeyEventExtModifiersSupplement

This also fixes `logical_key` and `text` not reported in `KeyEvent`.

src/platform/mod.rs

@@ -53,5 +53,13 @@ pub mod run_on_demand;
 ))]
 pub mod pump_events;
 
+#[cfg(any(
+    windows_platform,
+    macos_platform,
+    x11_platform,
+    wayland_platform,
+    orbital_platform,
+    docsrs
+))]
 pub mod modifier_supplement;
 pub mod scancode;