Add NVSHMEM optimizations and benchmarks#20

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szaman19 wants to merge 3 commits intoLBANN:mainfrom

szaman19:dgraph-nvshmem-tests

Commits on Sep 10, 2025

Add NVSHMEM scatter cached implementation with option for static cache to reuse cache over multiple layers
szaman19
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Remove combined p2p kernel for now (will look into merging in the future)
szaman19
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Add fall back option for the local aggregation
szaman19
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