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>;

frontend/wailsjs/go/main/App.js

@@ -5,3 +5,11 @@
 export function Close() {
   return window['go']['main']['App']['Close']();
 }
+
+export function GetLamps() {
+  return window['go']['main']['App']['GetLamps']();
+}
+
+export function SetLampBrightness(arg1, arg2) {
+  return window['go']['main']['App']['SetLampBrightness'](arg1, arg2);
+}