feat(editor): scaffolding store and view manager in affine (#11840)

Closes: BS-3254

blocksuite/affine/blocks/callout/src/store.ts

@@ -4,7 +4,7 @@ import {
 } from '@blocksuite/affine-ext-loader';
 import { CalloutBlockSchemaExtension } from '@blocksuite/affine-model';
 
-export default class CalloutStoreExtension extends StoreExtensionProvider {
+export class CalloutStoreExtension extends StoreExtensionProvider {
   override name = 'affine-callout-block';
 
   override setup(context: StoreExtensionContext) {

blocksuite/affine/blocks/callout/src/view.ts

@@ -10,7 +10,7 @@ import { CalloutKeymapExtension } from './callout-keymap';
 import { calloutSlashMenuConfig } from './configs/slash-menu';
 import { effects } from './effects';
 
-export default class CalloutViewExtension extends ViewExtensionProvider {
+export class CalloutViewExtension extends ViewExtensionProvider {
   override name = 'affine-callout-block';
 
   override effect() {