ggml : block interleaving support for Q4_K quantization for x86 AVX2 architecture (ggml-org#12332)

* Add block interleaving support for Q4_K quantization

* Remove whitespaces and fix CI/CD issues

* Update pointer of bsums from int16_t to const int16_t

* Add vector version of quantize_q8_K_4x8 function

* Update code formatting based on review comments

Author: Srihari-mcw