Add auto slider/box mode to number entity (#57737)

homeassistant/components/number/const.py

@@ -1,10 +1,16 @@
 """Provides the constants needed for the component."""
 
+from typing import Final
+
 ATTR_VALUE = "value"
 ATTR_MIN = "min"
 ATTR_MAX = "max"
 ATTR_STEP = "step"
 
+MODE_AUTO: Final = "auto"
+MODE_BOX: Final = "box"
+MODE_SLIDER: Final = "slider"
+
 DEFAULT_MIN_VALUE = 0.0
 DEFAULT_MAX_VALUE = 100.0
 DEFAULT_STEP = 1.0