Add Check-For-Updates in menu and some notifications (#4437)

src/common/ipc/update-available.ipc.ts

@@ -22,6 +22,8 @@
 import type { UpdateInfo } from "electron-updater";
 
 export const UpdateAvailableChannel = "update-available";
+export const AutoUpdateChecking = "auto-update:checking";
+export const AutoUpdateNoUpdateAvailable = "auto-update:no-update";
 export const AutoUpdateLogPrefix = "[UPDATE-CHECKER]";
 
 export type UpdateAvailableFromMain = [backChannel: string, updateInfo: UpdateInfo];