ggml: add Q1_0 1-bit quantization support (CPU) (#21273)
* ggml: add Q1_0 and Q1_0_g128 1-bit quantization support (CPU)
* add generic fallback for x86
* remove Q1_0 (group size 32)
* rename Q1_0_g128 => Q1_0
* fix Q1_0 LlamaFileType Enum
* Fix trailing spaces; add generic fallback for othre backends
* Apply suggestions from code review
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* fix /r/n spacing + arch-fallback
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
