Add LightEffectModule for dynamic light effects on SMART bulbs (#887)

Support the `light_effect` module which allows setting the effect to Off
or Party or Relax. Uses the new `Feature.Type.Choice`. Does not
currently allow editing of effects.

kasa/tests/smart/modules/test_light_effect.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from itertools import chain
+from typing import cast
+
+import pytest
+from pytest_mock import MockerFixture
+
+from kasa import Device, Feature
+from kasa.smart.modules import LightEffectModule
+from kasa.tests.device_fixtures import parametrize
+
+light_effect = parametrize(
+    "has light effect", component_filter="light_effect", protocol_filter={"SMART"}
+)
+
+
+@light_effect
+async def test_light_effect(dev: Device, mocker: MockerFixture):
+    """Test light effect."""
+    light_effect = cast(LightEffectModule, dev.modules.get("LightEffectModule"))
+    assert light_effect
+
+    feature = light_effect._module_features["light_effect"]
+    assert feature.type == Feature.Type.Choice
+
+    call = mocker.spy(light_effect, "call")
+    assert feature.choices == light_effect.effect_list
+    assert feature.choices
+    for effect in chain(reversed(feature.choices), feature.choices):
+        await light_effect.set_effect(effect)
+        enable = effect != LightEffectModule.LIGHT_EFFECTS_OFF
+        params: dict[str, bool | str] = {"enable": enable}
+        if enable:
+            params["id"] = light_effect._scenes_names_to_id[effect]
+        call.assert_called_with("set_dynamic_light_effect_rule_enable", params)
+        await dev.update()
+        assert light_effect.effect == effect
+        assert feature.value == effect
+
+    with pytest.raises(ValueError):
+        await light_effect.set_effect("foobar")