refactor(editor): finish the extension provider migration (#12259)

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

- **New Features**
  - Added AI-powered store extension to support chat and transcription block schemas.
  - Introduced a new database view extension for enhanced database block integration.

- **Refactor**
  - Updated and reorganized import paths for improved code structure and maintainability.
  - Consolidated and streamlined extension registration for store and view managers.

- **Chores**
  - Removed deprecated or redundant extension classes and imports.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/desktop/dialogs/import/index.tsx

@@ -1,5 +1,5 @@
 import { Button, IconButton, Modal } from '@affine/component';
-import { getStoreManager } from '@affine/core/blocksuite/manager/migrating-store';
+import { getStoreManager } from '@affine/core/blocksuite/manager/store';
 import { useAsyncCallback } from '@affine/core/components/hooks/affine-async-hooks';
 import type {
   DialogComponentProps,

packages/frontend/core/src/desktop/dialogs/setting/general-setting/editor/edgeless/snapshot.tsx

@@ -1,5 +1,5 @@
 import { Skeleton } from '@affine/component';
-import { getViewManager } from '@affine/core/blocksuite/manager/migrating-view';
+import { getViewManager } from '@affine/core/blocksuite/manager/view';
 import type { EditorSettingSchema } from '@affine/core/modules/editor-setting';
 import { EditorSettingService } from '@affine/core/modules/editor-setting';
 import { EdgelessCRUDIdentifier } from '@blocksuite/affine/blocks/surface';