feat(engine): implement toggle event

espanso-engine/src/event/mod.rs

@@ -82,6 +82,7 @@ pub enum EventType {
   Enabled,
   DisableRequest,
   EnableRequest,
+  ToggleRequest,
   SecureInputEnabled(internal::SecureInputEnabledEvent),
   SecureInputDisabled,
 

espanso-engine/src/process/middleware/disable.rs

@@ -93,6 +93,10 @@ impl Middleware for DisableMiddleware {
         *enabled = false;
         has_status_changed = true;
       }
+      EventType::ToggleRequest => {
+        *enabled = !*enabled;
+        has_status_changed = true;
+      }
       _ => {}
     }