WH46 missing PM1.0 and PM4.0 sensors (#151821)

Co-authored-by: Joost Lekkerkerker <[email protected]>

Author: GSzabados

homeassistant/components/ecowitt/sensor.py

@@ -230,6 +230,17 @@
         native_unit_of_measurement=PERCENTAGE,
         state_class=SensorStateClass.MEASUREMENT,
     ),
+    EcoWittSensorTypes.PM1: SensorEntityDescription(
+        key="PM1",
+        device_class=SensorDeviceClass.PM1,
+        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        state_class=SensorStateClass.MEASUREMENT,
+    ),
+    EcoWittSensorTypes.PM4: SensorEntityDescription(
+        key="PM4",
+        native_unit_of_measurement=CONCENTRATION_MICROGRAMS_PER_CUBIC_METER,
+        state_class=SensorStateClass.MEASUREMENT,
+    ),
 }