[hdpowerview] Add new battery level channel (#11206)

* Introduce new batteryLevel channel.

Fixes #11205

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>

bundles/org.openhab.binding.hdpowerview/src/test/java/org/openhab/binding/hdpowerview/HDPowerViewJUnitTests.java

@@ -356,6 +356,8 @@ public class HDPowerViewJUnitTests {
             pos = shadePos.getState(PRIMARY_ACTUATOR, VANE_COORDS);
             assertEquals(UnDefType.class, pos.getClass());
 
+            assertEquals(3, shadeData.batteryStatus);
+
             assertEquals(4, shadeData.signalStrength);
         } catch (JsonParseException e) {
             fail(e.getMessage());

bundles/org.openhab.binding.hdpowerview/src/test/resources/duette.json

@@ -6,8 +6,8 @@
 		{
 			"id": 63778,
 			"type": 8,
-			"batteryStatus": 0,
-			"batteryStrength": 0,
+			"batteryStatus": 3,
+			"batteryStrength": 168,
 			"roomId": 891,
 			"firmware": {
 				"revision": 1,