feat(editor): divider and edgeless text extensions (#11846)

Closes: BS-3193
Closes: BS-3194

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

@@ -0,0 +1,17 @@
+import {
+  type StoreExtensionContext,
+  StoreExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+import { DividerBlockSchemaExtension } from '@blocksuite/affine-model';
+
+import { DividerBlockAdapterExtensions } from './adapters/extension';
+
+export class DividerStoreExtension extends StoreExtensionProvider {
+  override name = 'affine-divider-block';
+
+  override setup(context: StoreExtensionContext) {
+    super.setup(context);
+    context.register(DividerBlockSchemaExtension);
+    context.register(DividerBlockAdapterExtensions);
+  }
+}

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

@@ -0,0 +1,24 @@
+import {
+  type ViewExtensionContext,
+  ViewExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+import { BlockViewExtension } from '@blocksuite/std';
+import { literal } from 'lit/static-html.js';
+
+import { effects } from './effects';
+
+export class DividerViewExtension extends ViewExtensionProvider {
+  override name = 'affine-divider-block';
+
+  override effect() {
+    super.effect();
+    effects();
+  }
+
+  override setup(context: ViewExtensionContext) {
+    super.setup(context);
+    context.register([
+      BlockViewExtension('affine:divider', literal`affine-divider`),
+    ]);
+  }
+}