feat: add GraphRAG framework and integrate TuGraph (#1506)

Co-authored-by: KingSkyLi <15566300566@163.com>
Co-authored-by: aries_ckt <916701291@qq.com>
Co-authored-by: Fangyin Cheng <staneyffer@gmail.com>

dbgpt/app/knowledge/request/request.py

@@ -53,6 +53,10 @@ class DocumentQueryRequest(BaseModel):
     page_size: int = 20
 
 
+class GraphVisRequest(BaseModel):
+    limit: int = 100
+
+
 class DocumentSyncRequest(BaseModel):
     """Sync request"""