### What problem does this PR solve?
```
RAGFlow(api/default)> parse file 'test.html';
Parsing HTML file: test.html
<html>
......
```
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
```
RAGFlow(api/default)> parse file 'README.md';
Parsing Markdown file: README.md
--- AST tree:
HTMLBlock '<div align="center">\n<a href="https:…'
```
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
Add parser config
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
Now we can parse 'pptx', 'ppt', 'doc', 'xls', 'xlsx'
```
RAGFlow(api/default)> parse file 'test.pptx';
Parsing PPTX file: test.pptx
Document format: pptx
```
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
As title.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
