[WIP] Use DTensor-based tensor parallel

[kwen2501]

Stack from ghstack (oldest at bottom):

• -> [WIP] Use DTensor-based tensor parallel #180

Status:

• Switched to DTensor based TP in regular tensor path
• Result is correct, but there is a perf gap (seems to perform extra colls in the beginning, investigating)
• TODO: switch to DTensor for quantized path too

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