[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 ...

vllm/entrypoints/logger.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import List, Optional, Union
 
 from vllm.logger import init_logger

vllm/entrypoints/openai/api_server.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import atexit
 import gc

vllm/entrypoints/openai/cli_args.py

+# SPDX-License-Identifier: Apache-2.0
 """
 This file contains the command line arguments for the vLLM's
 OpenAI-compatible server. It is kept in a separate file for documentation

vllm/entrypoints/openai/logits_processors.py

+# SPDX-License-Identifier: Apache-2.0
+
 from functools import lru_cache, partial
 from typing import Dict, FrozenSet, Iterable, List, Optional, Union
 

vllm/entrypoints/openai/protocol.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Adapted from
 # https://github.com/lm-sys/FastChat/blob/168ccc29d3f7edc50823016105c024fe2282732a/fastchat/protocol/openai_api_protocol.py
 import re

vllm/entrypoints/openai/reasoning_parsers/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from .abs_reasoning_parsers import ReasoningParser, ReasoningParserManager
 from .deepseek_r1_reasoning_parser import DeepSeekR1ReasoningParser
 

vllm/entrypoints/openai/reasoning_parsers/abs_reasoning_parsers.py

+# SPDX-License-Identifier: Apache-2.0
+
 import os
 from functools import cached_property
 from typing import Callable, Dict, List, Optional, Sequence, Tuple, Type, Union

vllm/entrypoints/openai/reasoning_parsers/deepseek_r1_reasoning_parser.py

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

vllm/entrypoints/openai/run_batch.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 from http import HTTPStatus
 from io import StringIO

vllm/entrypoints/openai/serving_chat.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import json
 import time

vllm/entrypoints/openai/serving_completion.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import time
 from typing import AsyncGenerator, AsyncIterator, Dict, List, Optional

vllm/entrypoints/openai/serving_embedding.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import base64
 import time

vllm/entrypoints/openai/serving_engine.py

+# SPDX-License-Identifier: Apache-2.0
+
 import json
 from concurrent.futures.thread import ThreadPoolExecutor
 from http import HTTPStatus

vllm/entrypoints/openai/serving_models.py

+# SPDX-License-Identifier: Apache-2.0
+
 import json
 import pathlib
 from dataclasses import dataclass

vllm/entrypoints/openai/serving_pooling.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import base64
 import time

vllm/entrypoints/openai/serving_rerank.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 from typing import Any, AsyncGenerator, Dict, List, Optional, Union, cast
 

vllm/entrypoints/openai/serving_score.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import time
 from typing import Any, AsyncGenerator, Dict, List, Optional, Union, cast

vllm/entrypoints/openai/serving_tokenization.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Final, List, Optional, Union
 
 from fastapi import Request

vllm/entrypoints/openai/tool_parsers/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from .abstract_tool_parser import ToolParser, ToolParserManager
 from .granite_20b_fc_tool_parser import Granite20bFCToolParser
 from .granite_tool_parser import GraniteToolParser

vllm/entrypoints/openai/tool_parsers/abstract_tool_parser.py

+# SPDX-License-Identifier: Apache-2.0
+
 import os
 from functools import cached_property
 from typing import Callable, Dict, List, Optional, Sequence, Type, Union