Refa: Chats /chat API to RESTFul (#13881)

### What problem does this PR solve?

 Refactor Chats /chat API to RESTFul.

### Type of change

- [x] Refactoring

sdk/python/ragflow_sdk/modules/base.py

@@ -54,5 +54,9 @@ class Base:
         res = self.rag.put(path, json)
         return res
 
+    def patch(self, path, json):
+        res = self.rag.patch(path, json)
+        return res
+
     def __str__(self):
         return str(self.to_json())