[Hardware] p2p support for Huawei Ascend NPU

[kip-cxj]

P2P mode adaptation

We have successfully adapted the P2P mode and validated it by running the existing examples from the current project in a two-node scenario.

Status

✅ Implementation
✅ Testing

Prerequisites

1. This implementation uses the same environment configuration as the previous PR：[Hardware] broadcast support for Huawei Ascend NPU #39

2. Need to install Ascend Direct Transport in Mooncake. Ascend device cannot install transfer engine via pip, requires source compilation.

Limitations and Future Work

1. A temporary sleep has been added to circumvent a mutual lock issue caused by current Ascend hardware constraints. We plan to resolve this natively on Ascend in future updates.
2. We intend to create an example where the complete model weights reside on Server 0, while vLLM is deployed on Server 1. The Checkpoint Engine will be utilized to synchronize weights from Server 0 to Server 1.

[hanhan-networking]

@weixiao-huang Please review this pr.

[weixiao-huang]

Plz resolve conflict from main branch. Thanks