add initial long press deep sleep handling

ch32v-insert-coin/src/app.rs

@@ -431,10 +431,18 @@ impl App {
         #[cfg(feature = "enable_print")]
         println!("short press");
     }
-    fn main_button_long_press(&self) {
+    fn main_button_long_press(&mut self) {
         // TODO
         #[cfg(feature = "enable_print")]
         println!("long press");
+        self.set_state(State::DeepSleep);
+    }
+}
+
+// Getters
+impl App {
+    pub fn get_state(&self) -> State {
+        self.state
     }
 }