add all-gather, all-reduce, and reduce-scatter benchmarks #13
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add all-reduce for MPI, NCCL, and RCCL
add all-gather for RCCL
add reduce-scatter for MPI, NCCL, and RCCL
add flags to Makefile for ROCm and RCCL
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This PR adds scripts to benchmark collective communication libraries (MPI, NCCL, RCCL) for different message sizes across different nodes.