Rename bulb interface to light and move fan and light interface to interfaces (#910)

Also rename BulbPreset to LightPreset.

kasa/interfaces/fan.py

@@ -0,0 +1,20 @@
+"""Module for Fan Interface."""
+
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+
+from ..device import Device
+
+
+class Fan(Device, ABC):
+    """Interface for a Fan."""
+
+    @property
+    @abstractmethod
+    def fan_speed_level(self) -> int:
+        """Return fan speed level."""
+
+    @abstractmethod
+    async def set_fan_speed_level(self, level: int):
+        """Set fan speed level."""