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* [TE/PyTorch][MoE] Add FP8 padding and unpadding module 

 1. Add multi-tensor padding kernel for FP8 with padding size = 16.
 2. Add FP8Padding and Fp8Unpadding module
 3. Add Padded GroupedLinear unit tests

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* fp8 mha with rope
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* avoid index select in cast ops
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* resolve comments
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* fix a merge bug
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* remove dtype from args
* update docs with permutation ops

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* Add permutation functions

* Add permutation ops

* Remove the dependency on cutlass

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* Rewrite the unit test and enable skipping if FP8 is unavailable

* Rename exposed C++ API and reorder its parameters + take NVTETensor as inputs

* Use Float8Tensor for FP8 input

* Move dtype to ctx

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