Test: Add dialog app test suite and update common.py with dialog endpoints (#8729)

### What problem does this PR solve?

This commit introduces a comprehensive test suite for the dialog app,
including tests for creating, updating, retrieving, listing, and
deleting dialogs. Additionally, the common.py file has been updated to
include necessary API endpoints and helper functions for dialog
operations.

### Type of change

- [x] Add test cases

test/testcases/test_web_api/common.py

@@ -25,7 +25,7 @@ HEADERS = {"Content-Type": "application/json"}
 KB_APP_URL = f"/{VERSION}/kb"
 DOCUMENT_APP_URL = f"/{VERSION}/document"
 CHUNK_API_URL = f"/{VERSION}/chunk"
-# CHAT_ASSISTANT_API_URL = "/api/v1/chats"
+DIALOG_APP_URL = f"/{VERSION}/dialog"
 # SESSION_WITH_CHAT_ASSISTANT_API_URL = "/api/v1/chats/{chat_id}/sessions"
 # SESSION_WITH_AGENT_API_URL = "/api/v1/agents/{agent_id}/sessions"
 
@@ -201,3 +201,60 @@ def batch_add_chunks(auth, doc_id, num):
         res = add_chunk(auth, {"doc_id": doc_id, "content_with_weight": f"chunk test {i}"})
         chunk_ids.append(res["data"]["chunk_id"])
     return chunk_ids
+
+
+# DIALOG APP
+def create_dialog(auth, payload=None, *, headers=HEADERS, data=None):
+    res = requests.post(url=f"{HOST_ADDRESS}{DIALOG_APP_URL}/set", headers=headers, auth=auth, json=payload, data=data)
+    return res.json()
+
+
+def update_dialog(auth, payload=None, *, headers=HEADERS, data=None):
+    res = requests.post(url=f"{HOST_ADDRESS}{DIALOG_APP_URL}/set", headers=headers, auth=auth, json=payload, data=data)
+    return res.json()
+
+
+def get_dialog(auth, params=None, *, headers=HEADERS):
+    res = requests.get(url=f"{HOST_ADDRESS}{DIALOG_APP_URL}/get", headers=headers, auth=auth, params=params)
+    return res.json()
+
+
+def list_dialogs(auth, *, headers=HEADERS):
+    res = requests.get(url=f"{HOST_ADDRESS}{DIALOG_APP_URL}/list", headers=headers, auth=auth)
+    return res.json()
+
+
+def delete_dialog(auth, payload=None, *, headers=HEADERS, data=None):
+    res = requests.post(url=f"{HOST_ADDRESS}{DIALOG_APP_URL}/rm", headers=headers, auth=auth, json=payload, data=data)
+    return res.json()
+
+
+def batch_create_dialogs(auth, num, kb_ids=None):
+    if kb_ids is None:
+        kb_ids = []
+
+    dialog_ids = []
+    for i in range(num):
+        payload = {
+            "name": f"dialog_{i}",
+            "description": f"Test dialog {i}",
+            "kb_ids": kb_ids,
+            "prompt_config": {"system": "You are a helpful assistant. Use the following knowledge to answer questions: {knowledge}", "parameters": [{"key": "knowledge", "optional": False}]},
+            "top_n": 6,
+            "top_k": 1024,
+            "similarity_threshold": 0.1,
+            "vector_similarity_weight": 0.3,
+            "llm_setting": {"model": "gpt-3.5-turbo", "temperature": 0.7},
+        }
+        res = create_dialog(auth, payload)
+        if res["code"] == 0:
+            dialog_ids.append(res["data"]["id"])
+    return dialog_ids
+
+
+def delete_dialogs(auth):
+    res = list_dialogs(auth)
+    if res["code"] == 0 and res["data"]:
+        dialog_ids = [dialog["id"] for dialog in res["data"]]
+        if dialog_ids:
+            delete_dialog(auth, {"dialog_ids": dialog_ids})