Add graphrag (#1793)

### What problem does this PR solve?

#1594

### Type of change

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

rag/svr/task_executor.py

@@ -45,7 +45,7 @@ from rag.nlp import search, rag_tokenizer
 from io import BytesIO
 import pandas as pd
 
-from rag.app import laws, paper, presentation, manual, qa, table, book, resume, picture, naive, one, audio
+from rag.app import laws, paper, presentation, manual, qa, table, book, resume, picture, naive, one, audio, knowledge_graph
 
 from api.db import LLMType, ParserType
 from api.db.services.document_service import DocumentService
@@ -68,7 +68,8 @@ FACTORY = {
     ParserType.RESUME.value: resume,
     ParserType.PICTURE.value: picture,
     ParserType.ONE.value: one,
-    ParserType.AUDIO.value: audio
+    ParserType.AUDIO.value: audio,
+    ParserType.KG.value: knowledge_graph
 }