feat(editor): edgeless auto connect widget extension (#11990)

Closes: BS-3221
Closes: BS-3222

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

- **New Features**
  - Introduced extensions that conditionally register edgeless auto-connect and toolbar widgets with associated effects based on the view context.
  - Added new exports for edgeless auto-connect and toolbar widget views, making them available for external use.

- **Chores**
  - Updated dependencies and project references to include the extension loader for improved module integration.
  - Refined workspace configuration to reflect new package dependencies.

- **Refactor**
  - Streamlined registration and effect logic by removing legacy integration points for edgeless auto-connect and toolbar widgets.
  - Reorganized widget export paths to a more modular directory structure.

- **Bug Fixes**
  - Disabled pointer events on the edgeless navigator black background to prevent interaction interference.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

yarn.lock

@@ -3668,6 +3668,7 @@ __metadata:
     "@blocksuite/affine-block-note": "workspace:*"
     "@blocksuite/affine-block-surface": "workspace:*"
     "@blocksuite/affine-components": "workspace:*"
+    "@blocksuite/affine-ext-loader": "workspace:*"
     "@blocksuite/affine-model": "workspace:*"
     "@blocksuite/affine-shared": "workspace:*"
     "@blocksuite/global": "workspace:*"
@@ -3686,6 +3687,7 @@ __metadata:
   dependencies:
     "@blocksuite/affine-block-surface": "workspace:*"
     "@blocksuite/affine-components": "workspace:*"
+    "@blocksuite/affine-ext-loader": "workspace:*"
     "@blocksuite/affine-model": "workspace:*"
     "@blocksuite/affine-rich-text": "workspace:*"
     "@blocksuite/affine-shared": "workspace:*"