feat: opt-out of events in the app-server (#11319)

Add `optOutNotificationMethods` in the app-server to opt-out events
based on exact method matching

codex-rs/debug-client/src/client.rs

@@ -102,6 +102,7 @@ impl AppServerClient {
                 },
                 capabilities: Some(InitializeCapabilities {
                     experimental_api: true,
+                    opt_out_notification_methods: None,
                 }),
             },
         };