Added an event when BLE is deinitialized and memory is reclaimed

Fixes https://github.com/espressif/esp-matter/issues/777

components/esp_matter/esp_matter.h

@@ -127,6 +127,8 @@ enum
     /** Signals that operational credentials are changed, which may not be persistent.
     Can be used to affect what is needed for UpdateNOC prior to commit */
     kFabricUpdated,
+    /** Signals that BLE is deinitialized and heap memory is reclaimed */
+    kBLEDeinitialized,
 };
 
 } // DeviceEventType

components/esp_matter/esp_matter_core.cpp

@@ -876,6 +876,7 @@ static void deinit_ble_if_commissioned(void)
                 return;
             }
             ESP_LOGI(TAG, "BLE deinit successful and memory reclaimed");
+            PostEvent(chip::DeviceLayer::DeviceEventType::kBLEDeinitialized);
         }
 #endif /* CONFIG_BT_ENABLED && CONFIG_USE_BLE_ONLY_FOR_COMMISSIONING */
 }

examples/light/main/app_main.cpp

@@ -106,6 +106,11 @@ static void app_event_cb(const ChipDeviceEvent *event, intptr_t arg)
     case chip::DeviceLayer::DeviceEventType::kFabricCommitted:
         ESP_LOGI(TAG, "Fabric is committed");
         break;
+
+    case chip::DeviceLayer::DeviceEventType::kBLEDeinitialized:
+        ESP_LOGI(TAG, "BLE deinitialized and memory reclaimed");
+        break;
+
     default:
         break;
     }