Add tensor padding options to improve hardware utilization

🚀 The feature, motivation, and pitch

Recent discussion on Twitter highlighted the importance of tensor padding to improve hardware util. NeMo seems to already support GPU-friendly vocab size padding from discussions with @cat-state but we should also consider adding an optional pad_to_multiple_of arg to our tokenizer calls with the accelerate/transformers backend to satisfy Tensor Core requirements.

The implementer should also provide system plots to display any improvements/findings.

Alternatives

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Additional context

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