Add HCCL backend for Huawei Ascend NPU#2

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Commits on May 12, 2026

Add HCCL backend for Huawei Ascend NPU

can-gaa-hou
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torchcomms-sync-bot
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Sync with upstream master and adapt hccl modifications

orangeH25
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torchcomms-sync-bot
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fix hccl setup

orangeH25
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torchcomms-sync-bot
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fix(hccl): skip backend compilation when torch_npu is missing

orangeH25
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torchcomms-sync-bot
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