Add DurationConverter (#108865)

* Add DurationConverter

* Update withings snapshots

* Add sensor test

* Fix tests

* Update snapshots after #108902 was merged

tests/components/sensor/test_init.py

@@ -37,6 +37,7 @@ from homeassistant.const import (
     UnitOfPressure,
     UnitOfSpeed,
     UnitOfTemperature,
+    UnitOfTime,
     UnitOfVolume,
     UnitOfVolumeFlowRate,
     UnitOfVolumetricFlux,
@@ -599,6 +600,22 @@ async def test_restore_sensor_restore_state(
             13.0,
             "49.2",
         ),
+        (
+            SensorDeviceClass.DURATION,
+            UnitOfTime.SECONDS,
+            UnitOfTime.HOURS,
+            UnitOfTime.HOURS,
+            5400.0,
+            "1.5000",
+        ),
+        (
+            SensorDeviceClass.DURATION,
+            UnitOfTime.DAYS,
+            UnitOfTime.MINUTES,
+            UnitOfTime.MINUTES,
+            0.5,
+            "720.0",
+        ),
     ],
 )
 async def test_custom_unit(