[Misc] Add SPDX-License-Identifier headers to python source files (#12628)

- **Add SPDX license headers to python source files**
- **Check for SPDX headers using pre-commit**

commit 9d7ef44c3cfb72ca4c32e1c677d99259d10d4745
Author: Russell Bryant <rbryant@redhat.com>
Date:   Fri Jan 31 14:18:24 2025 -0500

    Add SPDX license headers to python source files
    
This commit adds SPDX license headers to python source files as
recommended to
the project by the Linux Foundation. These headers provide a concise way
that is
both human and machine readable for communicating license information
for each
source file. It helps avoid any ambiguity about the license of the code
and can
    also be easily used by tools to help manage license compliance.
    
The Linux Foundation runs license scans against the codebase to help
ensure
    we are in compliance with the licenses of the code we use, including
dependencies. Having these headers in place helps that tool do its job.
    
    More information can be found on ...

tests/entrypoints/openai/test_root_path.py

+# SPDX-License-Identifier: Apache-2.0
+
 import contextlib
 import os
 from typing import Any, List, NamedTuple

tests/entrypoints/openai/test_run_batch.py

+# SPDX-License-Identifier: Apache-2.0
+
 import json
 import subprocess
 import sys

tests/entrypoints/openai/test_score.py

+# SPDX-License-Identifier: Apache-2.0
+
 import pytest
 import requests
 

tests/entrypoints/openai/test_serving_chat.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 from contextlib import suppress
 from dataclasses import dataclass

tests/entrypoints/openai/test_serving_models.py

+# SPDX-License-Identifier: Apache-2.0
+
 from http import HTTPStatus
 from unittest.mock import MagicMock
 

tests/entrypoints/openai/test_shutdown.py

+# SPDX-License-Identifier: Apache-2.0
+
 import openai
 import pytest
 

tests/entrypoints/openai/test_tokenization.py

+# SPDX-License-Identifier: Apache-2.0
+
 import pytest
 import pytest_asyncio
 import requests

tests/entrypoints/openai/test_video.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Dict, List
 
 import openai

tests/entrypoints/openai/test_vision.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Dict, List
 
 import openai

tests/entrypoints/openai/test_vision_embedding.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Dict
 
 import pytest

tests/entrypoints/openai/tool_parsers/test_pythonic_tool_parser.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import List
 from unittest.mock import MagicMock
 

tests/entrypoints/openai/tool_parsers/utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Iterable, List, Tuple, Union
 
 from vllm.entrypoints.openai.protocol import (ChatCompletionRequest,

tests/entrypoints/test_chat_utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 import warnings
 from typing import Optional
 

tests/kernels/allclose_default.py

+# SPDX-License-Identifier: Apache-2.0
+
 import torch
 
 # Reference default values of atol and rtol are from

tests/kernels/conftest.py

+# SPDX-License-Identifier: Apache-2.0
+
 import pytest
 
 from vllm.utils import (create_kv_caches_with_random,

tests/kernels/quant_utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Optional, Tuple, Union
 
 import torch

tests/kernels/test_activation.py

+# SPDX-License-Identifier: Apache-2.0
+
 import random
 from typing import Type
 

tests/kernels/test_aqlm.py

+# SPDX-License-Identifier: Apache-2.0
+
 import torch
 
 from tests.kernels.utils import opcheck

tests/kernels/test_attention.py

+# SPDX-License-Identifier: Apache-2.0
+
 import random
 from typing import List, Optional, Tuple
 

tests/kernels/test_attention_selector.py

+# SPDX-License-Identifier: Apache-2.0
+
 from unittest.mock import Mock, patch
 
 import pytest