Add occupancy sensor to the all-clusters-app (#13585)

examples/all-clusters-app/esp32/main/main.cpp

diff --git a/examples/all-clusters-app/esp32/main/main.cpp b/examples/all-clusters-app/esp32/main/main.cpp
index a98e4e9..840d3d1 100644
--- a/examples/all-clusters-app/esp32/main/main.cpp
+++ b/examples/all-clusters-app/esp32/main/main.cpp
@@ -508,6 +508,12 @@
     AddEndpoint("Door 2");
     AddCluster("Door");
     AddAttribute("State", "Closed");
+
+    AddDevice("Occupancy Sensor");
+    AddEndpoint("External");
+    AddCluster("Occupancy Sensor");
+    AddAttribute("Occupancy", "1");
+    app::Clusters::OccupancySensing::Attributes::Occupancy::Set(1, 1);
 }
 
 WiFiWidget pairingWindowLED;