feat (zigbee_smart_bulb): add optional power memory entity

Some zigbee bulbs that match seem to have this.

custom_components/tuya_local/devices/zigbee_smart_bulb.yaml

@@ -142,3 +142,12 @@ entities:
           - dps_val: null
             value: false
           - value: true
+  - entity: text
+    name: Power memory
+    category: config
+    hidden: true
+    dps:
+      - id: 33
+        type: base64
+        optional: true
+        name: value