feat(infra): add convenience api to get workspace from doc (#7934)

Author: EYHN

packages/common/infra/src/modules/doc/entities/doc.ts

@@ -1,18 +1,27 @@
 import type { RootBlockModel } from '@blocksuite/blocks';
 
 import { Entity } from '../../../framework';
+import type { WorkspaceService } from '../../workspace';
 import type { DocScope } from '../scopes/doc';
 import type { DocsStore } from '../stores/docs';
 import type { DocMode } from './record';
 
 export class Doc extends Entity {
   constructor(
     public readonly scope: DocScope,
-    private readonly store: DocsStore
+    private readonly store: DocsStore,
+    private readonly workspaceService: WorkspaceService
   ) {
     super();
   }
 
+  /**
+   * for convenience
+   */
+  get workspace() {
+    return this.workspaceService.workspace;
+  }
+
   get id() {
     return this.scope.props.docId;
   }

packages/common/infra/src/modules/doc/index.ts

@@ -28,6 +28,6 @@ export function configureDocModule(framework: Framework) {
     .entity(DocRecord, [DocsStore])
     .entity(DocRecordList, [DocsStore])
     .scope(DocScope)
-    .entity(Doc, [DocScope, DocsStore])
+    .entity(Doc, [DocScope, DocsStore, WorkspaceService])
     .service(DocService);
 }