Add fan module (#764)

Co-authored-by: Steven B <51370195+sdb9696@users.noreply.github.com>

kasa/smart/modules/__init__.py

@@ -9,6 +9,7 @@ from .cloudmodule import CloudModule
 from .colortemp import ColorTemperatureModule
 from .devicemodule import DeviceModule
 from .energymodule import EnergyModule
+from .fanmodule import FanModule
 from .firmware import Firmware
 from .humidity import HumiditySensor
 from .ledmodule import LedModule
@@ -30,6 +31,7 @@ __all__ = [
     "AutoOffModule",
     "LedModule",
     "Brightness",
+    "FanModule",
     "Firmware",
     "CloudModule",
     "LightTransitionModule",