add DTensor to VLE and fix 2D sharding group in EBC #2626
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Summary:
Adding DTensor state dict to VLE, this is identical to EBC DTensor path.
Future work of this diff is to consolidate the logic of EBC/PEA/VLE state dict into one parent class because of their significant similarities
A revert diff removed the 2D sharding logic in embedding bag collection mistakenly: D66800554, this diff adds it back in
Differential Revision: D65555595