chore: refactor browser IPC into TS and app API into TS (#16921)

* chore: refactor browser IPC into typescript

* chore: refactor app.ts into Typescript

* Refactors app.dock into cpp
* Removes app.launcher which has not existed for 3 years
* Removes 2 deprecated APIs (that have been deprecated for more than one
major)
* Refactors deprecate.ts as well

lib/browser/ipc-main-internal.ts

@@ -0,0 +1,8 @@
+import { EventEmitter } from 'events'
+
+const emitter = new EventEmitter()
+
+// Do not throw exception when channel name is "error".
+emitter.on('error', () => {})
+
+export const ipcMainInternal = emitter