Add light presets common module to devices. (#907)

Adds light preset common module for switching to presets and saving presets.
Deprecates the `presets` attribute and `save_preset` method from the `bulb` 
interface in favour of the modular approach.  Allows setting preset for `iot` 
which was not previously supported.

kasa/smart/modules/__init__.py

@@ -18,6 +18,7 @@ from .humiditysensor import HumiditySensor
 from .led import Led
 from .light import Light
 from .lighteffect import LightEffect
+from .lightpreset import LightPreset
 from .lightstripeffect import LightStripEffect
 from .lighttransition import LightTransition
 from .reportmode import ReportMode
@@ -41,6 +42,7 @@ __all__ = [
     "Led",
     "Brightness",
     "Fan",
+    "LightPreset",
     "Firmware",
     "Cloud",
     "Light",