feat: add collective communication primitives for CP#182
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新增通信层基础能力，为后续 context parallel 等并行策略提供底层通信算子支持。
主要改动：
CclImpl/NcclImpl中新增AlltoAll接口；在ProcessGroup中新增AlltoAll；在parallel::function中新增 AlltoAll functional wrapper。NcclImpl::AlltoAll支持两路实现：NCCL 2.28.3 及以上使用原生 ncclAlltoAll；低版本 NCCL fallback 到 grouped ncclSend / ncclRecv。torch.distributed.batch_isend_irecv，用于一次性提交一组 p2p send/recv op）：新增P2POpType/P2POp定义，ProcessGroup::BatchSendRecv，复用现有 compute/comm stream event 同步模式，并使用 CCL group 语义提交批量 p2p 操作。