add bubble menu from v1

packages/extension-bubble-menu/src/bubble-menu.ts

@@ -0,0 +1,29 @@
+import { Extension } from '@tiptap/core'
+import { BubbleMenuPlugin } from './bubble-menu-plugin'
+
+export interface BubbleMenuOptions {
+  element: HTMLElement,
+  keepInBounds: boolean,
+  onUpdate: () => void,
+}
+
+export const BubbleMenu = Extension.create<BubbleMenuOptions>({
+  name: 'bubbleMenu',
+
+  defaultOptions: {
+    element: document.createElement('div'),
+    keepInBounds: true,
+    onUpdate: () => ({}),
+  },
+
+  addProseMirrorPlugins() {
+    return [
+      BubbleMenuPlugin({
+        editor: this.editor,
+        element: this.options.element,
+        keepInBounds: this.options.keepInBounds,
+        onUpdate: this.options.onUpdate,
+      }),
+    ]
+  },
+})