refactor(editor): extract widgets (#12304)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Introduced two new widgets: Edgeless Dragging Area and Note Slicer, now available for use.
  - Added extension support for these widgets, enabling enhanced interaction and integration within the application.

- **Chores**
  - Updated package configurations and workspace settings to include the new widgets and their dependencies.
  - Added project references and configuration files to support modular development and build processes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/root/src/view.ts

@@ -18,11 +18,7 @@ import { PageClipboard, ReadOnlyClipboard } from './clipboard';
 import { builtinToolbarConfig } from './configs/toolbar';
 import { EdgelessClipboardController, EdgelessRootService } from './edgeless';
 import { EdgelessElementToolbarExtension } from './edgeless/configs/toolbar';
-import {
-  edgelessDraggingAreaWidget,
-  EdgelessLocker,
-  noteSlicerWidget,
-} from './edgeless/edgeless-root-spec';
+import { EdgelessLocker } from './edgeless/edgeless-root-spec';
 import { AltCloneExtension } from './edgeless/interact-extensions/clone-ext';
 import { effects } from './effects';
 import { fallbackKeymap } from './keyboard/keymap';
@@ -89,8 +85,6 @@ export class RootViewExtension extends ViewExtensionProvider {
     }
     context.register([
       BlockViewExtension('affine:page', literal`affine-edgeless-root`),
-      edgelessDraggingAreaWidget,
-      noteSlicerWidget,
       EdgelessClipboardController,
       AltCloneExtension,
     ]);