Manage ragflow-sdk with poetry (#3115)

### What problem does this PR solve?

Manage ragflow-sdk with poetry
### Type of change

- [x] Refactoring

sdk/python/ragflow_sdk/modules/session.py

@@ -0,0 +1,85 @@
+import json
+
+from .base import Base
+
+
+class Session(Base):
+    def __init__(self, rag, res_dict):
+        self.id = None
+        self.name = "New session"
+        self.messages = [{"role": "assistant", "content": "Hi! I am your assistant，can I help you?"}]
+        self.chat_id = None
+        super().__init__(rag, res_dict)
+
+    def ask(self, question: str, stream: bool = False):
+        for message in self.messages:
+            if "reference" in message:
+                message.pop("reference")
+        res = self.post(f"/chats/{self.chat_id}/completions",
+                        {"question": question, "stream": True,"session_id":self.id}, stream=stream)
+        for line in res.iter_lines():
+            line = line.decode("utf-8")
+            if line.startswith("{"):
+                json_data = json.loads(line)
+                raise Exception(json_data["message"])
+            if line.startswith("data:"):
+                json_data = json.loads(line[5:])
+                if json_data["data"] != True:
+                    answer = json_data["data"]["answer"]
+                    reference = json_data["data"]["reference"]
+                    temp_dict = {
+                        "content": answer,
+                        "role": "assistant"
+                    }
+                    if "chunks" in reference:
+                        chunks = reference["chunks"]
+                        chunk_list = []
+                        for chunk in chunks:
+                            new_chunk = {
+                                "id": chunk["chunk_id"],
+                                "content": chunk["content_with_weight"],
+                                "document_id": chunk["doc_id"],
+                                "document_name": chunk["docnm_kwd"],
+                                "dataset_id": chunk["kb_id"],
+                                "image_id": chunk["img_id"],
+                                "similarity": chunk["similarity"],
+                                "vector_similarity": chunk["vector_similarity"],
+                                "term_similarity": chunk["term_similarity"],
+                                "positions": chunk["positions"],
+                            }
+                            chunk_list.append(new_chunk)
+                        temp_dict["reference"] = chunk_list
+                    message = Message(self.rag, temp_dict)
+                    yield message
+
+    def update(self,update_message):
+        res = self.put(f"/chats/{self.chat_id}/sessions/{self.id}",
+                        update_message)
+        res = res.json()
+        if res.get("code") != 0:
+            raise Exception(res.get("message"))
+
+class Message(Base):
+    def __init__(self, rag, res_dict):
+        self.content = "Hi! I am your assistant，can I help you?"
+        self.reference = None
+        self.role = "assistant"
+        self.prompt = None
+        self.id = None
+        super().__init__(rag, res_dict)
+
+
+class Chunk(Base):
+    def __init__(self, rag, res_dict):
+        self.id = None
+        self.content = None
+        self.document_id = ""
+        self.document_name = ""
+        self.dataset_id = ""
+        self.image_id = ""
+        self.similarity = None
+        self.vector_similarity = None
+        self.term_similarity = None
+        self.positions = None
+        super().__init__(rag, res_dict)
+