Fix set_state for common light modules (#929)

PR contains a number of fixes from testing with HA devices:

- Fixes a bug with turning the light on and off via `set_state`
- Aligns `set_brightness` behaviour across `smart` and `iot` devices
such that a value of 0 is off.
- Aligns `set_brightness` behaviour for `IotDimmer` such that setting
the brightness turns on the device with a transition of 1ms. ([HA
comment](https://github.com/home-assistant/core/pull/117839#discussion_r1608720006))
- Fixes a typing issue in `LightState`.
- Adds `ColorTempRange` and `HSV` to `__init__.py`
- Adds a `state` property to the interface returning `LightState` for
validating `set_state` changes.
- Adds tests for `set_state`

kasa/__init__.py

@@ -35,7 +35,7 @@ from kasa.exceptions import (
     UnsupportedDeviceError,
 )
 from kasa.feature import Feature
-from kasa.interfaces.light import Light, LightState
+from kasa.interfaces.light import HSV, ColorTempRange, Light, LightState
 from kasa.iotprotocol import (
     IotProtocol,
     _deprecated_TPLinkSmartHomeProtocol,  # noqa: F401
@@ -60,6 +60,8 @@ __all__ = [
     "EmeterStatus",
     "Device",
     "Light",
+    "ColorTempRange",
+    "HSV",
     "Plug",
     "Module",
     "KasaException",