XPU now supports MoE kernel(MegaBlocks) implementation (#43435)
* Add moe kernel for XPU
* Support xpu moe kernel tests
* Style
* Update tests/models/gpt_oss/test_modeling_gpt_oss.py
Co-authored-by: Mohamed Mekkouri <93391238+MekkCyber@users.noreply.github.com>
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Co-authored-by: Mohamed Mekkouri <93391238+MekkCyber@users.noreply.github.com>