Add strip segment module for configurable light strip length (#1744)

A light strip can be cut shorter than it ships, and the device has to be
told how much of it is actually there so effects and colours span the
right distance. The Tapo app exposes this as "Light Strip Length".
python-kasa has no way to read or change it, so the setting is missing
from Home Assistant.

This change exposes a new feature backed by `segment` component:
- add a `Segment` module: `REQUIRED_COMPONENT = "segment"`,
`QUERY_GETTER_NAME = "get_device_segment"`
- expose one Number feature, `strip_segments`, range 0-50,
`Category.Config`
- add a `segments` property and `set_segments()`, which writes
`set_device_segment`

kasa/smart/modules/__init__.py

@@ -29,6 +29,7 @@ from .light import Light
 from .lighteffect import LightEffect
 from .lightpreset import LightPreset
 from .lightstripeffect import LightStripEffect
+from .lightstripsegment import LightStripSegment
 from .lighttransition import LightTransition
 from .matter import Matter
 from .mop import Mop
@@ -83,6 +84,7 @@ __all__ = [
     "SmartLightEffect",
     "PowerProtection",
     "OverheatProtection",
+    "LightStripSegment",
     "Speaker",
     "HomeKit",
     "Matter",