[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 the SPDX site:
    
    - https://spdx.dev/learn/handling-license-info/

Signed-off-by: Russell Bryant <rbryant@redhat.com>

commit 5a1cf1cb3b80759131c73f6a9dddebccac039dea
Author: Russell Bryant <rbryant@redhat.com>
Date:   Fri Jan 31 14:36:32 2025 -0500

    Check for SPDX headers using pre-commit
Signed-off-by: Russell Bryant <rbryant@redhat.com>

---------
Signed-off-by: Russell Bryant <rbryant@redhat.com>

vllm/model_executor/layers/quantization/quark/quark.py

+# SPDX-License-Identifier: Apache-2.0
+
 import fnmatch
 import re
 from typing import Any, Dict, List, Optional, cast

vllm/model_executor/layers/quantization/quark/quark_moe.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Any, Callable, Dict, Optional
 
 import torch

vllm/model_executor/layers/quantization/quark/schemes/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from .quark_scheme import QuarkScheme
 from .quark_w8a8_fp8 import QuarkW8A8Fp8
 from .quark_w8a8_int8 import QuarkW8A8Int8

vllm/model_executor/layers/quantization/quark/schemes/quark_scheme.py

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

vllm/model_executor/layers/quantization/quark/schemes/quark_w8a8_fp8.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Callable, List, Optional
 
 import torch

vllm/model_executor/layers/quantization/quark/schemes/quark_w8a8_int8.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import Callable, List, Optional, Set
 
 import torch

vllm/model_executor/layers/quantization/quark/utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 import re
 from typing import Any, Iterable, Optional
 

vllm/model_executor/layers/quantization/schema.py

+# SPDX-License-Identifier: Apache-2.0
 """
 This file contains the Pydantic schemas for various quantization-related
 parameters. When a relevant quantization technique is specified, these

vllm/model_executor/layers/quantization/tpu_int8.py

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

vllm/model_executor/layers/quantization/utils/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from .layer_utils import replace_parameter, update_tensor_inplace
 
 __all__ = ['update_tensor_inplace', 'replace_parameter']

vllm/model_executor/layers/quantization/utils/fp8_utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Adapted from https://github.com/sgl-project/sglang/pull/2575
 import functools
 import json

vllm/model_executor/layers/quantization/utils/layer_utils.py

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

vllm/model_executor/layers/quantization/utils/machete_utils.py

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

vllm/model_executor/layers/quantization/utils/marlin_utils.py

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

vllm/model_executor/layers/quantization/utils/marlin_utils_fp8.py

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

vllm/model_executor/layers/quantization/utils/marlin_utils_test.py

+# SPDX-License-Identifier: Apache-2.0
 """Utility functions used for tests and benchmarks"""
 
 from typing import List, Optional

vllm/model_executor/layers/quantization/utils/marlin_utils_test_24.py

+# SPDX-License-Identifier: Apache-2.0
 """Utility functions used for tests and benchmarks"""
 
 import random

vllm/model_executor/layers/quantization/utils/marlin_utils_test_qqq.py

+# SPDX-License-Identifier: Apache-2.0
+
 from typing import List
 
 import numpy

vllm/model_executor/layers/quantization/utils/quant_utils.py

+# SPDX-License-Identifier: Apache-2.0
 """This file is used for /tests and /benchmarks"""
 from typing import List, Optional, Tuple
 

vllm/model_executor/layers/quantization/utils/w8a8_utils.py

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