add keyword extraction in graph (#1373)

### What problem does this PR solve?
#918 

### Type of change

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

graph/templates/HR_callout_zh.json

@@ -1,5 +1,5 @@
 {
-    "id": 0,
+    "id": 1,
     "title": "HR call-out assistant(Chinese)",
     "description": "A HR call-out assistant. It will introduce the given job, answer the candidates' question about this job. And the most important thing is that it will try to obtain the contact information of the candidates. What you need to do is to link a knowledgebase which contains job description in 'Retrieval' component.",
     "canvas_type": "chatbot",