Restore hotkeys in pane_grid example

- Implement `subscription::events_with`
- Remove `pane_grid::KeyPressEvent`
- Return closest sibling in `pane_grid::State::close`

examples/pane_grid/Cargo.toml

@@ -7,3 +7,4 @@ publish = false
 
 [dependencies]
 iced = { path = "../..", features = ["debug"] }
+iced_native = { path = "../../native" }