[Feature] FP8 communication in ShardFormer

[GuangyaoZhang]

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🚨 Issue number

resolve #5916

📝 What does this PR do?

Accuracy on GPT2 finetune example

TP/SP	Acc(FP16)	Acc(FP8)
TP only	0.689	0.728
Split gather	0.728	0.729

It is wierd the accuracy is improved. Possibly the introduced noise by FP8 serves as a good Regularization item.

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