Add MPS backend for Apple Silicon#1853

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imperatormk wants to merge 3 commits intobitsandbytes-foundation:mainfrom

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Commits on Jan 31, 2026

Add MPS backend with optimized Metal kernels for Apple Silicon
imperatormk
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Fix int8_vectorwise_quant to zero outliers before absmax computation
imperatormk
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Commits on Feb 1, 2026

Fix view() -> reshape() for non-contiguous tensors in MPS backend
imperatormk
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