Add Adalight support (#956)

A component to support [Adalight](https://learn.adafruit.com/adalight-diy-ambient-tv-lighting).
This allows to control addressable LEDs over UART, by pushing data right into LEDs.

The most useful to use [Prismatik](https://github.com/psieg/Lightpack) to create
an immersive effect on PC.

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

esphome/components/adalight/__init__.py

@@ -0,0 +1,24 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import uart
+from esphome.components.light.types import AddressableLightEffect
+from esphome.components.light.effects import register_addressable_effect
+from esphome.const import CONF_NAME, CONF_UART_ID
+
+DEPENDENCIES = ['uart']
+
+adalight_ns = cg.esphome_ns.namespace('adalight')
+AdalightLightEffect = adalight_ns.class_(
+    'AdalightLightEffect', uart.UARTDevice, AddressableLightEffect)
+
+CONFIG_SCHEMA = cv.Schema({})
+
+
+@register_addressable_effect('adalight', AdalightLightEffect, "Adalight", {
+    cv.GenerateID(CONF_UART_ID): cv.use_id(uart.UARTComponent)
+})
+def adalight_light_effect_to_code(config, effect_id):
+    effect = cg.new_Pvariable(effect_id, config[CONF_NAME])
+    yield uart.register_uart_device(effect, config)
+
+    yield effect