Implement fetching brightness from api

frontend/wailsjs/go/main/App.d.ts

@@ -2,3 +2,7 @@
 // This file is automatically generated. DO NOT EDIT
 
 export function Close():Promise<void>;
+
+export function GetLamps():Promise<Array<string>>;
+
+export function SetLampBrightness(arg1:number,arg2:number):Promise<string>;