feat: Added lua definition files

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

definitions/automation:device_manager.lua

@@ -0,0 +1,12 @@
+---@meta
+
+---@class DeviceManager
+local DeviceManager
+---@param device DeviceInterface
+function DeviceManager:add(device) end
+
+---@param cron string
+---@param callback fun()
+function DeviceManager:schedule(cron, callback) end
+
+return DeviceManager