Sync with GGML: add GGML bf16 support #2640
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* Add GGUF bf16 type support * Add non avx impl for vec_dot_bf16 * Fix from_u32 * Fix loading * Fix dequant of bf16
* Update kernels for metal bf16 * Fix typo * Check if have bfloat
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This is part 1 of 3 chunks of #2615 for easier review.
It synchronizes the GGML kernels to support bf16.
I will open the others sequentially as this one is merged.