feat: add getComponentsMap() for DocumentModel

packages/shell/src/document-model.ts

@@ -186,6 +186,15 @@ export default class DocumentModel {
     this[documentSymbol].removeNode(idOrNode as any);
   }
 
+  /**
+   * componentsMap of documentModel
+   * @param extraComps
+   * @returns
+   */
+  getComponentsMap(extraComps?: string[]) {
+    return this[documentSymbol].getComponentsMap(extraComps);
+  }
+
   /**
    * 当前 document 新增节点事件
    */