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[Core][Distributed] refactor pynccl to hold multiple communicators (#4591)

Co-authored-by: Zhuohan Li <zhuohan123@gmail.com>

[Core] replace narrow-usage RayWorkerVllm to general WorkerWrapper to reduce code duplication (#4024)

[WIP][Core][Refactor] move vllm/model_executor/parallel_utils into vllm/distributed and vllm/device_communicators (#3950)

[Core][Test] move local_rank to the last arg with default value to keep api compatible (#3711)