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/modules/doc-info/use-std.ts

@@ -1,4 +1,4 @@
-import { getViewManager } from '@affine/core/blocksuite/manager/migrating-view';
+import { getViewManager } from '@affine/core/blocksuite/manager/view';
 import { DebugLogger } from '@affine/debug';
 import { BlockStdScope } from '@blocksuite/affine/std';
 import type { Store } from '@blocksuite/affine/store';

packages/frontend/core/src/modules/import-clipper/services/import.ts

@@ -1,4 +1,4 @@
-import { getStoreManager } from '@affine/core/blocksuite/manager/migrating-store';
+import { getStoreManager } from '@affine/core/blocksuite/manager/store';
 import { MarkdownTransformer } from '@blocksuite/affine/widgets/linked-doc';
 import { Service } from '@toeverything/infra';
 

packages/frontend/core/src/modules/integration/entities/writer.ts

@@ -1,4 +1,4 @@
-import { getStoreManager } from '@affine/core/blocksuite/manager/migrating-store';
+import { getStoreManager } from '@affine/core/blocksuite/manager/store';
 import { MarkdownTransformer } from '@blocksuite/affine/widgets/linked-doc';
 import { Entity } from '@toeverything/infra';
 

packages/frontend/core/src/modules/workspace/impls/doc.ts

@@ -1,4 +1,4 @@
-import { getStoreManager } from '@affine/core/blocksuite/manager/migrating-store';
+import { getStoreManager } from '@affine/core/blocksuite/manager/store';
 import {
   AwarenessStore,
   type Doc,