feat: add workspace_id field to Create serializer

--bug=1057315 --user=刘瑞斌 【文件夹】-非默认工作空间，在根目录下创建文件夹失败 https://www.tapd.cn/62980211/s/1717846

Author: liuruibin

apps/folders/serializers/folder.py

@@ -102,6 +102,7 @@ class FolderSerializer(serializers.Serializer):
     parent_id = serializers.CharField(required=False, label=_('parent id'))
 
     class Create(serializers.Serializer):
+        workspace_id = serializers.CharField(required=True, label=_('workspace id'))
         user_id = serializers.UUIDField(required=True, label=_('user id'))
         source = serializers.CharField(required=True, label=_('source'))