[RESEARCH] Investigate Renumbering as Part of Uniform Neighbor Sample Call

[alexbarghi-nv]

It should be possible in our C++ sampling code to renumber the final edgelist to conform with PyG numbering requirements (vertices are numbered in order of appearance). This would be done in parallel over all GPUs, yielding a significant performance boost over creating the MFGs during the loading process.

The only catch is that uniform_neighbor_sample would need to also output the original vertex ids so that the features can be retrieved during the loading process.

This would remove the need for a separate create_mfg C++ function to be called at loading time.

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1. C++ Create MFG Capability for sampling output #3718
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2. C API Expose MFG Capability for sampling output #3719
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3. PLC Expose MFG Capability for sampling output #3720
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