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`
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