Adding ability to have meta data per tensor row (#61)

* POC: per row scale

This is a POC how to work around opinionated ggml to
have scales per row rather than per block.
Only implemened for Zen4 and only for iq2_tn.

* POC per row scale: iq2_tn on NEON

* POC per row scale: iq2_tn on Metal

* Per row scale Metal templates

* iq1_tn: shrink to 1.625 bpw (NEON and Metal)

* POC per row scale: CUDA

* POC per row scale: add CUDA TODOs

There are two places in ggml-cuda.cu left where it is assumed
that type_size * n_per_row / block_size is the way to compute
and handle row sizes. This does not affect simple usage,
but will lead to issues when tensors are split between GPUs.

* Per row scales - CUDA

The only place left where there are unnecessary assumptions being made
is in the Flash Attention code. As we are not using any quants that
use per row scales for quantized KV cache, it should be OK for now.

* Update IQ1_TN and IQ2_TN bpw shown to user

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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>

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