feat: add ingestion pipeline children delimiters configs (#11979)

### What problem does this PR solve?

Add children delimiters for Ingestion pipeline config

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/dataset/dataset-setting/index.tsx

@@ -63,6 +63,8 @@ export default function DatasetSettings() {
         layout_recognize: DocumentType.DeepDOC,
         chunk_token_num: 512,
         delimiter: `\n`,
+        enable_children: false,
+        children_delimiter: `\n`,
         auto_keywords: 0,
         auto_questions: 0,
         html4excel: false,