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/package.json

@@ -21,7 +21,7 @@
     "@blocksuite/affine-block-paragraph": "workspace:*",
     "@blocksuite/affine-block-surface": "workspace:*",
     "@blocksuite/affine-components": "workspace:*",
-    "@blocksuite/affine-fragment-doc-title": "workspace:*",
+    "@blocksuite/affine-ext-loader": "workspace:*",
     "@blocksuite/affine-gfx-brush": "workspace:*",
     "@blocksuite/affine-gfx-connector": "workspace:*",
     "@blocksuite/affine-gfx-group": "workspace:*",
@@ -35,8 +35,6 @@
     "@blocksuite/affine-rich-text": "workspace:*",
     "@blocksuite/affine-shared": "workspace:*",
     "@blocksuite/affine-widget-edgeless-toolbar": "workspace:*",
-    "@blocksuite/affine-widget-slash-menu": "workspace:*",
-    "@blocksuite/affine-widget-toolbar": "workspace:*",
     "@blocksuite/data-view": "workspace:*",
     "@blocksuite/global": "workspace:*",
     "@blocksuite/icons": "^2.2.12",
@@ -47,22 +45,20 @@
     "@preact/signals-core": "^1.8.0",
     "@toeverything/theme": "^1.1.12",
     "@types/lodash-es": "^4.17.12",
-    "@types/mdast": "^4.0.4",
-    "@vanilla-extract/css": "^1.17.0",
     "dompurify": "^3.2.4",
-    "fflate": "^0.8.2",
     "html2canvas": "^1.4.1",
     "lit": "^3.2.0",
     "lodash-es": "^4.17.21",
     "minimatch": "^10.0.1",
     "rxjs": "^7.8.1",
-    "simple-xml-to-json": "^1.2.2",
     "yjs": "^13.6.21",
     "zod": "^3.23.8"
   },
   "exports": {
     ".": "./src/index.ts",
-    "./effects": "./src/effects.ts"
+    "./effects": "./src/effects.ts",
+    "./store": "./src/store.ts",
+    "./view": "./src/view.ts"
   },
   "files": [
     "src",