feat(editor): root block extension (#12063)

Closes: BS-3202

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

- **New Features**
  - Introduced new root block store and view extensions, enhancing modularity and integration options for root block functionality.
  - Exported the EdgelessLocker class for broader usage.

- **Improvements**
  - Updated export paths for root block modules, enabling clearer and more flexible module access.
  - Enhanced view extension setup to better tailor user interface and interactions based on context.

- **Removals**
  - Removed legacy migrating store and view extension logic, streamlining extension management and reducing unused code.
  - Removed multiple deprecated block specifications and common extension collections to simplify the codebase.
  - Deleted AI page root block specification, retaining only lifecycle watcher functionality.

- **Chores**
  - Updated dependencies and project references to support new extension loader integration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/root/tsconfig.json

@@ -18,7 +18,7 @@
     { "path": "../paragraph" },
     { "path": "../surface" },
     { "path": "../../components" },
-    { "path": "../../fragments/doc-title" },
+    { "path": "../../ext-loader" },
     { "path": "../../gfx/brush" },
     { "path": "../../gfx/connector" },
     { "path": "../../gfx/group" },
@@ -32,8 +32,6 @@
     { "path": "../../rich-text" },
     { "path": "../../shared" },
     { "path": "../../widgets/edgeless-toolbar" },
-    { "path": "../../widgets/slash-menu" },
-    { "path": "../../widgets/toolbar" },
     { "path": "../../data-view" },
     { "path": "../../../framework/global" },
     { "path": "../../../framework/std" },