refactor(editor): doc as store extension (#12170)

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

## Summary by CodeRabbit

- **New Features**
  - Introduced new exports related to workspace management, making additional workspace features available.

- **Refactor**
  - Updated how document and workspace types are imported and exported, consolidating and reorganizing module structure.
  - Shifted dependency management for document instances to use an internal provider mechanism.
  - Streamlined and centralized type imports across various modules.

- **Bug Fixes**
  - Removed an unused schema definition to improve code clarity.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/framework/store/src/test/test-doc.ts

@@ -1,12 +1,8 @@
 import * as Y from 'yjs';
 
+import type { Doc, GetStoreOptions, Workspace } from '../extension/index.js';
 import type { YBlock } from '../model/block/types.js';
-import {
-  type Doc,
-  type GetStoreOptions,
-  StoreContainer,
-  type Workspace,
-} from '../model/index.js';
+import { StoreContainer } from '../model/index.js';
 import type { AwarenessStore } from '../yjs/index.js';
 import type { TestWorkspace } from './test-workspace.js';
 

blocksuite/framework/store/src/test/test-meta.ts

@@ -5,7 +5,7 @@ import type {
   DocMeta,
   DocsPropertiesMeta,
   WorkspaceMeta,
-} from '../model/index.js';
+} from '../extension/index.js';
 import { createYProxy } from '../reactive/proxy.js';
 
 type DocCollectionMetaState = {

blocksuite/framework/store/src/test/test-workspace.ts

@@ -14,8 +14,12 @@ import { Subject } from 'rxjs';
 import { Awareness } from 'y-protocols/awareness.js';
 import * as Y from 'yjs';
 
-import type { ExtensionType } from '../extension/extension.js';
-import type { Doc, Workspace, WorkspaceMeta } from '../model/index.js';
+import type {
+  Doc,
+  ExtensionType,
+  Workspace,
+  WorkspaceMeta,
+} from '../extension/index.js';
 import { type IdGenerator, nanoid } from '../utils/id-generator.js';
 import { AwarenessStore } from '../yjs/index.js';
 import { TestDoc } from './test-doc.js';