[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/v1/stats/common.py

+# SPDX-License-Identifier: Apache-2.0
+
 import time
 from dataclasses import dataclass
 from dataclasses import field as dataclass_field

vllm/v1/utils.py

+# SPDX-License-Identifier: Apache-2.0
+
 import multiprocessing
 import os
 import weakref

vllm/v1/worker/block_table.py

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

vllm/v1/worker/gpu_input_batch.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Datastructures defining an input batch
 
 from dataclasses import dataclass

vllm/v1/worker/gpu_model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 import gc
 import time
 from typing import TYPE_CHECKING, Dict, List, Optional, Tuple, cast

vllm/v1/worker/gpu_worker.py

+# SPDX-License-Identifier: Apache-2.0
 """A GPU worker class."""
 import gc
 import os

vllm/version.py

+# SPDX-License-Identifier: Apache-2.0
+
 try:
     from ._version import __version__, __version_tuple__
 except Exception as e:

vllm/worker/cache_engine.py

+# SPDX-License-Identifier: Apache-2.0
 """CacheEngine class for managing the KV cache."""
 from typing import List
 

vllm/worker/cpu_enc_dec_model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 import dataclasses
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Type, cast
 

vllm/worker/cpu_model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 import dataclasses
 import weakref
 from collections import defaultdict

vllm/worker/cpu_pooling_model_runner.py

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

vllm/worker/cpu_worker.py

+# SPDX-License-Identifier: Apache-2.0
 """A CPU worker class."""
 from typing import Dict, List, Optional, Set, Tuple, Type
 

vllm/worker/enc_dec_model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 import dataclasses
 import itertools
 from typing import Any, Dict, List, Optional, Tuple, Type, cast

vllm/worker/hpu_model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 ###############################################################################
 # Copyright (C) 2024 Habana Labs, Ltd. an Intel Company
 ###############################################################################

vllm/worker/hpu_worker.py

+# SPDX-License-Identifier: Apache-2.0
+
 ###############################################################################
 # Copyright (C) 2024 Habana Labs, Ltd. an Intel Company
 ###############################################################################

vllm/worker/model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 import dataclasses
 import gc
 import inspect

vllm/worker/model_runner_base.py

+# SPDX-License-Identifier: Apache-2.0
+
 import dataclasses
 import pickle
 from abc import ABC, abstractmethod

vllm/worker/multi_step_model_runner.py

+# SPDX-License-Identifier: Apache-2.0
+
 import dataclasses
 import functools
 from dataclasses import dataclass, field

vllm/worker/multi_step_tpu_worker.py

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

vllm/worker/multi_step_worker.py

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