feat(editor): insert a blank frame slash menu action (#10899)

Close [BS-2517](https://linear.app/affine-design/issue/BS-2517/%E6%B7%BB%E5%8A%A0frame%E5%85%A5%E5%8F%A3)

### What changes:
- add a insert blank frame action to slash menu
- move `EdgelessFrameManager` and `FrameOverlay` extensions to `FrameBlockSpec`
- make `FrameBlockSpec` as a part of `CommonBlockSpecs` such that we can use `EdgelessFrameManager` to create a frame more easily

https://github.com/user-attachments/assets/ddff5866-8933-4ce5-aaf4-873661407ee4

blocksuite/affine/blocks/block-frame/src/frame-spec.ts

@@ -2,6 +2,10 @@ import { BlockViewExtension } from '@blocksuite/block-std';
 import type { ExtensionType } from '@blocksuite/store';
 import { literal } from 'lit/static-html.js';
 
+import { EdgelessFrameManager, FrameOverlay } from './frame-manager';
+
 export const FrameBlockSpec: ExtensionType[] = [
   BlockViewExtension('affine:frame', literal`affine-frame`),
+  FrameOverlay,
+  EdgelessFrameManager,
 ];