feat: Configurable for excel, html table or row based text #2516 (#2538)

### What problem does this PR solve?

feat: Configurable for excel, html table or row based text #2516

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

web/src/locales/en.ts

@@ -150,6 +150,8 @@ export default {
       topK: 'Top-K',
       topKTip: `K chunks will be fed into rerank models.`,
       delimiter: `Delimiter`,
+      html4excel: 'Excel to HTML',
+      html4excelTip: `Excel will be parsed into HTML table or not. If it's FALSE, every row in Excel will be formed as a chunk.`,
     },
     knowledgeConfiguration: {
       titleDescription: