* make : add AVX512 detection to Makefile and CMakeLists.txt
* make : autodetect more AVX512 instruction subsets
* cmake : do not default to AVX512, must be enabled explicitly
* cmake : enable a set of AVX512 subsets, when AVX512 is turned on
* make : consolidate AVX512 subsets, add AVX512 VBMI
* cmake : revert to NO AVX512 setting, add settings for AVX512 VNNI and VBMI
* make : re-introduce AVX512VNNI back
* cmake : remove superfluous comment line
* ggml : embed Metal library source (ggml-metal.metal) into binary
enable by setting WHISPER_EMBED_METAL_LIBRARY
* rename the build option
* rename the preprocessor directive
* generate Metal library embedding assembly on-fly during build process
Didzis Gosko