feat(editor): template gfx extension (#11939)

Closes: BS-3212

blocksuite/affine/gfx/template/src/view.ts

@@ -0,0 +1,25 @@
+import {
+  type ViewExtensionContext,
+  ViewExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+
+import { effects } from './effects';
+import { TemplateTool } from './template-tool';
+import { templateSeniorTool } from './toolbar/senior-tool';
+
+export class TemplateViewExtension extends ViewExtensionProvider {
+  override name = 'affine-template-view';
+
+  override effect(): void {
+    super.effect();
+    effects();
+  }
+
+  override setup(context: ViewExtensionContext) {
+    super.setup(context);
+    if (this.isEdgeless(context.scope)) {
+      context.register(TemplateTool);
+      context.register(templateSeniorTool);
+    }
+  }
+}