Rework command menu extension API (#1144)

* Rework command menu API

* Update test

* Update README

* Prevent register other extension's command

browser_tests/extensionAPI.spec.ts

@@ -1,4 +1,4 @@
-import { expect } from '@playwright/test'
+import { expect, Locator } from '@playwright/test'
 import { comfyPageFixture as test } from './ComfyPage'
 
 test.describe('Topbar commands', () => {
@@ -12,24 +12,50 @@ test.describe('Topbar commands', () => {
 
   test('Should allow registering topbar commands', async ({ comfyPage }) => {
     await comfyPage.page.evaluate(() => {
-      window['app'].extensionManager.menu.registerTopbarCommands(
-        ['ext'],
-        [
+      window['app'].registerExtension({
+        name: 'TestExtension1',
+        commands: [
           {
             id: 'foo',
-            label: 'foo',
+            label: 'foo-command',
             function: () => {
               window['foo'] = true
             }
           }
+        ],
+        menuCommands: [
+          {
+            path: ['ext'],
+            commands: ['foo']
+          }
         ]
-      )
+      })
     })
 
-    await comfyPage.menu.topbar.triggerTopbarCommand(['ext', 'foo'])
+    await comfyPage.menu.topbar.triggerTopbarCommand(['ext', 'foo-command'])
     expect(await comfyPage.page.evaluate(() => window['foo'])).toBe(true)
   })
 
+  test('Should not allow register command defined in other extension', async ({
+    comfyPage
+  }) => {
+    await comfyPage.registerCommand('foo', () => alert(1))
+    await comfyPage.page.evaluate(() => {
+      window['app'].registerExtension({
+        name: 'TestExtension1',
+        menuCommands: [
+          {
+            path: ['ext'],
+            commands: ['foo']
+          }
+        ]
+      })
+    })
+
+    const menuItem: Locator = await comfyPage.menu.topbar.getMenuItem('ext')
+    expect(await menuItem.count()).toBe(0)
+  })
+
   test('Should allow registering keybindings', async ({ comfyPage }) => {
     await comfyPage.page.evaluate(() => {
       const app = window['app']