refactor: Split 'Event' docs/types into more specific Event types (#17038)

* Event = Base event type (with preventDefault)
* IpcMainEvent = Event that ipcMain emits (with sender, reply, etc.)
* IpcRendererEvent = Event that ipcRenderer emits (with sender,
senderId, etc.)
* KeyboardEvent = Event that we emit with keyboard flags (ctrlKey,
altKey, etc.)

This will dramatically improve peoples TS experience with IPC events

build/tsc.gni

@@ -22,6 +22,9 @@ template("typescript_build") {
       invoker.tsconfig,
       "//electron/tsconfig.json",
       "//electron/package-lock.json",
+      "//electron/typings/internal-ambient.d.ts",
+      "//electron/typings/internal-electron.d.ts",
+      "//electron/typings/internal-helpers.d.ts",
     ]
 
     type_roots = "node_modules/@types,typings"