feat(editor): add page dragging area widget extension (#12045)

Closes: BS-3364

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

- **New Features**
  - Introduced a new "Page Dragging Area" widget, enabling enhanced block selection and drag area detection within the user interface.
  - Added utilities for more precise block selection based on rectangular selection areas.

- **Improvements**
  - Integrated the new widget into the view extension system for consistent behavior across supported views.
  - Enhanced clipboard handling with comprehensive adapter configurations for various data types.

- **Refactor**
  - Streamlined widget registration and block selection logic for improved maintainability and modularity.
  - Removed legacy widget exports and registrations to centralize widget management.

- **Chores**
  - Updated workspace and TypeScript configurations to support the new widget module.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/all/src/extensions/view.ts

@@ -39,6 +39,7 @@ import { EdgelessZoomToolbarViewExtension } from '@blocksuite/affine-widget-edge
 import { FrameTitleViewExtension } from '@blocksuite/affine-widget-frame-title/view';
 import { KeyboardToolbarViewExtension } from '@blocksuite/affine-widget-keyboard-toolbar/view';
 import { LinkedDocViewExtension } from '@blocksuite/affine-widget-linked-doc/view';
+import { PageDraggingAreaViewExtension } from '@blocksuite/affine-widget-page-dragging-area/view';
 import { RemoteSelectionViewExtension } from '@blocksuite/affine-widget-remote-selection/view';
 import { ScrollAnchoringViewExtension } from '@blocksuite/affine-widget-scroll-anchoring/view';
 import { SlashMenuViewExtension } from '@blocksuite/affine-widget-slash-menu/view';
@@ -104,5 +105,6 @@ export function getInternalViewExtensions() {
     ToolbarViewExtension,
     ViewportOverlayViewExtension,
     EdgelessZoomToolbarViewExtension,
+    PageDraggingAreaViewExtension,
   ];
 }

blocksuite/affine/all/src/widgets/page-dragging-area/index.ts

@@ -0,0 +1 @@
+export * from '@blocksuite/affine-widget-page-dragging-area';

blocksuite/affine/all/src/widgets/page-dragging-area/view.ts

@@ -0,0 +1 @@
+export * from '@blocksuite/affine-widget-page-dragging-area/view';