[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/spec_decode/mlp_speculator_worker.py

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

vllm/spec_decode/mqa_scorer.py

+# SPDX-License-Identifier: Apache-2.0
+
 from vllm.sequence import (ExecuteModelRequest, SequenceData,
                            SequenceGroupMetadata, get_all_seq_ids)
 from vllm.spec_decode.interfaces import (SpeculativeProposals,

vllm/spec_decode/multi_step_worker.py

+# SPDX-License-Identifier: Apache-2.0
+
 import copy
 import weakref
 from typing import Dict, List, Set, Tuple

vllm/spec_decode/ngram_worker.py

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

vllm/spec_decode/proposer_worker_base.py

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

vllm/spec_decode/smaller_tp_proposer_worker.py

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

vllm/spec_decode/spec_decode_worker.py

+# SPDX-License-Identifier: Apache-2.0
+
 import copy
 from collections import defaultdict
 from functools import cached_property

vllm/spec_decode/target_model_runner.py

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

vllm/spec_decode/top1_proposer.py

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

vllm/spec_decode/util.py

+# SPDX-License-Identifier: Apache-2.0
+
 import time
 from contextlib import contextmanager
 from typing import Dict, List, Optional, Sequence, Tuple

vllm/tracing.py

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

vllm/transformers_utils/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from vllm.envs import VLLM_USE_MODELSCOPE
 
 if VLLM_USE_MODELSCOPE:

vllm/transformers_utils/config.py

+# SPDX-License-Identifier: Apache-2.0
+
 import enum
 import json
 import os

vllm/transformers_utils/configs/__init__.py

+# SPDX-License-Identifier: Apache-2.0
+
 from vllm.transformers_utils.configs.chatglm import ChatGLMConfig
 from vllm.transformers_utils.configs.cohere2 import Cohere2Config
 from vllm.transformers_utils.configs.dbrx import DbrxConfig

vllm/transformers_utils/configs/arctic.py

+# SPDX-License-Identifier: Apache-2.0
+
 # yapf: disable
 # ruff: noqa: E501
 # coding=utf-8

vllm/transformers_utils/configs/chatglm.py

+# SPDX-License-Identifier: Apache-2.0
+
 # Adapted from
 # https://github.com/THUDM/ChatGLM2-6B
 from transformers import PretrainedConfig

vllm/transformers_utils/configs/cohere2.py

+# SPDX-License-Identifier: Apache-2.0
+
 # ruff: noqa
 
 # Adapted from

vllm/transformers_utils/configs/dbrx.py

+# SPDX-License-Identifier: Apache-2.0
+
 # yapf: disable
 # ruff: noqa: E501
 # coding=utf-8

vllm/transformers_utils/configs/deepseek_vl2.py

+# SPDX-License-Identifier: Apache-2.0
+
 # adapted from https://github.com/deepseek-ai/DeepSeek-VL2/blob/faf18023f24b962b32d9f0a2d89e402a8d383a78/deepseek_vl2/models/modeling_deepseek_vl_v2.py#L115-L268
 from typing import Tuple
 

vllm/transformers_utils/configs/eagle.py

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