On Orbital, implement KeyEventExtModifiersSupplement

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

src/platform/mod.rs

@@ -46,6 +46,7 @@ pub mod pump_events;
     macos_platform,
     x11_platform,
     wayland_platform,
+    orbital_platform,
     docsrs
 ))]
 pub mod modifier_supplement;