ggml: add Q1_0 1-bit quantization support (CPU) (llama/21273)

ggml: add Q1_0 1-bit quantization support (CPU) (llama/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 <redacted>
* fix /r/n spacing + arch-fallback

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Co-authored-by: Sigbjørn Skjæret <redacted>