Flow rate unit conversions and device class (#106077)

* Add volume flow rate conversions

* Add missing translations

* Adjust liter unit and add gallons per minute

* Adjust to min instead of m for minutes

* Add matching class for number

* Add some tests for number and sensor platform

* Add deprecated constants

* Add explicit list of flow rate for check

This reverts commit 105171af31.

tests/test_const.py

@@ -103,7 +103,13 @@ def test_all() -> None:
         ],
         "VOLUME_",
     )
-    + _create_tuples(const.UnitOfVolumeFlowRate, "VOLUME_FLOW_RATE_")
+    + _create_tuples(
+        [
+            const.UnitOfVolumeFlowRate.CUBIC_METERS_PER_HOUR,
+            const.UnitOfVolumeFlowRate.CUBIC_FEET_PER_MINUTE,
+        ],
+        "VOLUME_FLOW_RATE_",
+    )
     + _create_tuples(
         [
             const.UnitOfMass.GRAMS,