feat(editor): slash menu and toolbar widget extensions (#12002)

Closes: BS-3226
Closes: BS-3227
Closes: BS-3228
Closes: BS-3229

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

- **New Features**
  - Introduced new view extensions for remote selection, scroll anchoring, slash menu, and toolbar widgets, enhancing customization and integration capabilities.

- **Refactor**
  - Updated export paths and module structure for widget-related packages to improve modularity and accessibility.
  - Reorganized internal dependencies and removed redundant widget imports from core block packages.
  - Refactored edgeless-related widgets and components to use a standardized scope interface for improved context and state management.
  - Centralized graphics controller access and slot management through standardized context objects.

- **Chores**
  - Added and updated dependencies to streamline extension loading and workspace management.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/root/tsconfig.json

@@ -31,8 +31,6 @@
     { "path": "../../rich-text" },
     { "path": "../../shared" },
     { "path": "../../widgets/edgeless-toolbar" },
-    { "path": "../../widgets/remote-selection" },
-    { "path": "../../widgets/scroll-anchoring" },
     { "path": "../../widgets/slash-menu" },
     { "path": "../../widgets/toolbar" },
     { "path": "../../data-view" },