[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/transformers_utils/s3_utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 import fnmatch
 import os
 import shutil

vllm/transformers_utils/tokenizer.py

+# SPDX-License-Identifier: Apache-2.0
+
 import contextlib
 import os
 import warnings

vllm/transformers_utils/tokenizer_group/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Optional, Type
 
 from vllm.config import (LoRAConfig, ModelConfig, ParallelConfig,

vllm/transformers_utils/tokenizer_group/base_tokenizer_group.py

+# SPDX-License-Identifier: Apache-2.0
+
 from abc import ABC, abstractmethod
 from typing import List, Optional
 

vllm/transformers_utils/tokenizer_group/ray_tokenizer_group.py

+# SPDX-License-Identifier: Apache-2.0
+
 import asyncio
 import os
 from typing import List, Optional

vllm/transformers_utils/tokenizer_group/tokenizer_group.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import List, Optional
 
 from vllm.config import TokenizerPoolConfig

vllm/transformers_utils/tokenizers/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from .mistral import MistralTokenizer, maybe_serialize_tool_calls
 
 __all__ = ["MistralTokenizer", "maybe_serialize_tool_calls"]

vllm/transformers_utils/tokenizers/mistral.py

+# SPDX-License-Identifier: Apache-2.0
+
 import os
 import re
 from dataclasses import dataclass

vllm/transformers_utils/utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 from os import PathLike
 from pathlib import Path
 from typing import Union

vllm/triton_utils/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from vllm.triton_utils.importing import HAS_TRITON
 
 __all__ = ["HAS_TRITON"]

vllm/triton_utils/custom_cache_manager.py

+# SPDX-License-Identifier: Apache-2.0
+
 import os
 
 from triton.runtime.cache import (FileCacheManager, default_cache_dir,

vllm/triton_utils/importing.py

+# SPDX-License-Identifier: Apache-2.0
+
 from importlib.util import find_spec
 
 from vllm.logger import init_logger

vllm/usage/usage_lib.py

+# SPDX-License-Identifier: Apache-2.0
+
 import datetime
 import json
 import logging

vllm/utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 import argparse
 import asyncio
 import concurrent

vllm/v1/attention/backends/flash_attn.py

+# SPDX-License-Identifier: Apache-2.0
 """Attention layer with FlashAttention."""
 from dataclasses import dataclass
 from typing import Any, Dict, List, Optional, Tuple, Type

vllm/v1/core/encoder_cache_manager.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import TYPE_CHECKING, Dict, List, Set, Tuple
 
 from vllm.logger import init_logger

vllm/v1/core/kv_cache_manager.py

+# SPDX-License-Identifier: Apache-2.0
+
 from collections import defaultdict
 from typing import DefaultDict, Dict, Iterable, List, Optional, Tuple
 

vllm/v1/core/kv_cache_utils.py

+# SPDX-License-Identifier: Apache-2.0
 """KV-Cache Utilities."""
 from collections.abc import Sequence
 from dataclasses import dataclass

vllm/v1/core/scheduler.py

+# SPDX-License-Identifier: Apache-2.0
+
 from collections import deque
 from dataclasses import dataclass
 from typing import (TYPE_CHECKING, Deque, Dict, Iterable, List, Optional, Set,

vllm/v1/engine/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 import enum
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, List, Optional, Union