feat: Added lua definition files

Also added a pre-commit hook to ensure that the definitions files are
up-to-date.

definitions/automation:mqtt.lua

@@ -0,0 +1,27 @@
+-- DO NOT MODIFY, FILE IS AUTOMATICALLY GENERATED
+---@meta
+
+local mqtt
+
+---@class MqttConfig
+---@field host string
+---@field port integer
+---@field client_name string
+---@field username string
+---@field password string
+---@field tls boolean
+local MqttConfig
+
+---@class AsyncClient
+local AsyncClient
+---@async
+---@param topic string
+---@param message table?
+function AsyncClient:send_message(topic, message) end
+mqtt.AsyncClient = {}
+---@param device_manager DeviceManager
+---@param config MqttConfig
+---@return AsyncClient
+function mqtt.new(device_manager, config) end
+
+return mqtt