Make module names consistent and remove redundant module casting (#909)

Address the inconsistent naming of smart modules by removing all "Module" suffixes and aligning filenames with class names. Removes the casting of modules to the correct module type now that is is redundant. Update the adding of iot modules to use the ModuleName class rather than a free string.

kasa/smart/modules/fan.py

@@ -0,0 +1,80 @@
+"""Implementation of fan_control module."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from ...feature import Feature
+from ..smartmodule import SmartModule
+
+if TYPE_CHECKING:
+    from ..smartdevice import SmartDevice
+
+
+class Fan(SmartModule):
+    """Implementation of fan_control module."""
+
+    REQUIRED_COMPONENT = "fan_control"
+
+    def __init__(self, device: SmartDevice, module: str):
+        super().__init__(device, module)
+
+        self._add_feature(
+            Feature(
+                device,
+                id="fan_speed_level",
+                name="Fan speed level",
+                container=self,
+                attribute_getter="fan_speed_level",
+                attribute_setter="set_fan_speed_level",
+                icon="mdi:fan",
+                type=Feature.Type.Number,
+                minimum_value=0,
+                maximum_value=4,
+                category=Feature.Category.Primary,
+            )
+        )
+        self._add_feature(
+            Feature(
+                device,
+                id="fan_sleep_mode",
+                name="Fan sleep mode",
+                container=self,
+                attribute_getter="sleep_mode",
+                attribute_setter="set_sleep_mode",
+                icon="mdi:sleep",
+                type=Feature.Type.Switch,
+            )
+        )
+
+    def query(self) -> dict:
+        """Query to execute during the update cycle."""
+        return {}
+
+    @property
+    def fan_speed_level(self) -> int:
+        """Return fan speed level."""
+        return self.data["fan_speed_level"]
+
+    async def set_fan_speed_level(self, level: int):
+        """Set fan speed level, 0 for off, 1-4 for on."""
+        if level < 0 or level > 4:
+            raise ValueError("Invalid level, should be in range 0-4.")
+        if level == 0:
+            return await self.call("set_device_info", {"device_on": False})
+        return await self.call(
+            "set_device_info", {"device_on": True, "fan_speed_level": level}
+        )
+
+    @property
+    def sleep_mode(self) -> bool:
+        """Return sleep mode status."""
+        return self.data["fan_sleep_mode_on"]
+
+    async def set_sleep_mode(self, on: bool):
+        """Set sleep mode."""
+        return await self.call("set_device_info", {"fan_sleep_mode_on": on})
+
+    async def _check_supported(self):
+        """Is the module available on this device."""
+        return "fan_speed_level" in self.data