llama : support quantum K cache (#4312)
* llama : support quantum K cache (wip)
* metal : add F32 -> Q8_0 copy kernel
* cuda : add F32 -> Q8_0 copy kernel
ggml-ci
* cuda : use mmv kernel for quantum cache ops
* llama : pass KV cache type through API
* llama : fix build
ggml-ci
* metal : add F32 -> Q4_0 copy kernel
* metal : add F32 -> Q4_1 copy kernel
* cuda : wip
* cuda : add F32 -> Q4_0 and F32 -> Q4_1 copy kernels
* llama-bench : support type_k/type_v
* metal : use mm kernel only for quantum KV cache
* cuda : add comment
* llama : remove memory_f16 and kv_f16 flags
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Co-authored-by: slaren <slarengh@gmail.com>