ggml-cpu: arm64: q4_K repack gemm and gemv implementations (i8mm) (llama/16739)

ggml-cpu: arm64: q4_K repack gemm and gemv implementations (i8mm) (llama/16739)

* Enabled q4_K_8x8_q8_K path on ARM

* wip: I8mm qs multiplication, pending bias

* cpu : arm : REPACK gemm q4_K8x8 implementation

Signed-off-by: Alberto Cabrera <redacted>
* Guard gemm with proper features, improved superblock scale and min calc

Signed-off-by: Alberto Cabrera <redacted>
* cpu: arm: Implemented REPACK gemv for Q4_K

Signed-off-by: Alberto Cabrera <redacted>
* Removed completed TODO

* Fixed missing guards when selecting optimal repack type for Q4_K

Signed-off-by: Alberto Cabrera <redacted>
* Fixed macro guard for gemv

* Fixed wrong comment in GEMV

* Fixed warning for unused variable

* vdotq_s32 -> ggml_vdotq_s32

Signed-off-by: Alberto Cabrera <redacted>
* Clang-format issues

* Apply suggestions from code review

Co-authored-by: Diego Devesa <redacted>
* Removed unnecessary GGML_UNUSED

* Fixed guards in q4_k gemm and gemv (repack)

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Signed-off-by: Alberto Cabrera <redacted>
Co-authored-by: Diego Devesa <redacted>