[Misc] Add SPDX-FileCopyrightText (#19100)

Signed-off-by: simon-mo <simon.mo@hey.com>

vllm/distributed/kv_transfer/kv_connector/simple_connector.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 Simple KV Cache Connector for Distributed Machine Learning Inference
 

vllm/distributed/kv_transfer/kv_connector/utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 KV cache helper for store.
 """

vllm/distributed/kv_transfer/kv_connector/v1/__init__.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from vllm.distributed.kv_transfer.kv_connector.v1.base import (
     KVConnectorBase_V1, KVConnectorRole)
 

vllm/distributed/kv_transfer/kv_connector/v1/base.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 KVConnectorBase_V1 Class for Distributed KV Cache & Hidden State
 communication in vLLM v1

vllm/distributed/kv_transfer/kv_connector/v1/lmcache_connector.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from typing import TYPE_CHECKING
 
 import torch

vllm/distributed/kv_transfer/kv_connector/v1/multi_connector.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import copy
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, Any, Optional

vllm/distributed/kv_transfer/kv_connector/v1/nixl_connector.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import contextlib
 import math
 import threading

vllm/distributed/kv_transfer/kv_connector/v1/shared_storage_connector.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import hashlib
 import os
 from dataclasses import dataclass

vllm/distributed/kv_transfer/kv_connector_agent.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """A centralized entrypoint to perform distributed KV cache transfer.
 
 This implementation is a shim wrapper on two APIs exposed by `kv_connector`:

vllm/distributed/kv_transfer/kv_lookup_buffer/base.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 This file contains a new class `KVLookupBufferBase` that allows developers to
 think of KV cache operations as inserting new KV cache entries (`insert`)

vllm/distributed/kv_transfer/kv_lookup_buffer/mooncake_store.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 This file contains a new class `MooncakeStore` that allows developers to
 think of KV cache transfer operations as putting new KV cache entries

vllm/distributed/kv_transfer/kv_lookup_buffer/simple_buffer.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
     Implements a distributed key-value (KV) cache transfer mechanism.
 

vllm/distributed/kv_transfer/kv_pipe/base.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 This file defines an interface `KVPipeBase`
 that provides an abstraction for sending and receiving tensors, or None, via

vllm/distributed/kv_transfer/kv_pipe/mooncake_pipe.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import json
 import os

vllm/distributed/kv_transfer/kv_pipe/pynccl_pipe.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
     This module implements a PyNccl pipe for sending and receiving
     Optional[torch.Tensor] between distributed ranks with advanced

vllm/distributed/kv_transfer/kv_transfer_state.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from typing import TYPE_CHECKING, Optional
 
 from vllm import envs

vllm/distributed/parallel_state.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 # Copyright 2023 The vLLM team.
 # Adapted from

vllm/distributed/utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 # Copyright 2023 The vLLM team.
 # Adapted from

vllm/engine/arg_utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 # yapf: disable
 import argparse

vllm/engine/async_llm_engine.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import asyncio
 import copy