Add dataset with table parser type for Infinity and answer question in chat using SQL (#12541)

### What problem does this PR solve?

1) Create  dataset using table parser for infinity
2) Answer questions in chat using SQL

### Type of change

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

test/testcases/test_http_api/common.py

@@ -49,6 +49,11 @@ def update_dataset(auth, dataset_id, payload=None, *, headers=HEADERS, data=None
 
 
 def delete_datasets(auth, payload=None, *, headers=HEADERS, data=None):
+    """
+    Delete datasets.
+    The endpoint is DELETE /api/{VERSION}/datasets with payload {"ids": [...]}
+    This is the standard SDK REST API endpoint for dataset deletion.
+    """
     res = requests.delete(url=f"{HOST_ADDRESS}{DATASETS_API_URL}", headers=headers, auth=auth, json=payload, data=data)
     return res.json()
 
@@ -300,12 +305,6 @@ def metadata_summary(auth, dataset_id, params=None):
 
 
 # CHAT COMPLETIONS AND RELATED QUESTIONS
-def chat_completions(auth, chat_assistant_id, payload=None):
-    url = f"{HOST_ADDRESS}{CHAT_ASSISTANT_API_URL}/{chat_assistant_id}/completions"
-    res = requests.post(url=url, headers=HEADERS, auth=auth, json=payload)
-    return res.json()
-
-
 def related_questions(auth, payload=None):
     url = f"{HOST_ADDRESS}/api/{VERSION}/sessions/related_questions"
     res = requests.post(url=url, headers=HEADERS, auth=auth, json=payload)
@@ -355,3 +354,23 @@ def agent_completions(auth, agent_id, payload=None):
     url = f"{HOST_ADDRESS}{AGENT_API_URL}/{agent_id}/completions"
     res = requests.post(url=url, headers=HEADERS, auth=auth, json=payload)
     return res.json()
+
+
+def chat_completions(auth, chat_id, payload=None):
+    """
+    Send a question/message to a chat assistant and get completion.
+
+    Args:
+        auth: Authentication object
+        chat_id: Chat assistant ID
+        payload: Dictionary containing:
+            - question: str (required) - The question to ask
+            - stream: bool (optional) - Whether to stream responses, default False
+            - session_id: str (optional) - Session ID for conversation context
+
+    Returns:
+        Response JSON with answer data
+    """
+    url = f"{HOST_ADDRESS}/api/{VERSION}/chats/{chat_id}/completions"
+    res = requests.post(url=url, headers=HEADERS, auth=auth, json=payload)
+    return res.json()