refactor(editor): orgnize exports (#10709)

blocksuite/playground/apps/comment/comment-input.ts

@@ -1,6 +1,6 @@
 import { ShadowlessElement, TextSelection } from '@blocksuite/affine/block-std';
-import type { RichText } from '@blocksuite/affine/blocks';
 import { WithDisposable } from '@blocksuite/affine/global/lit';
+import type { RichText } from '@blocksuite/affine/rich-text';
 import { css, html, nothing } from 'lit';
 import { property, query } from 'lit/decorators.js';
 import * as Y from 'yjs';