Much faster prompt processing for IQ1_S and IQ1_M on ARM_NEON

[ikawrakow]

This PR corresponds to PRs #531, #533, #534, #546, #549, #550, #552, and applies the on-the-fly repacking technique to
the 1-bit quants IQ1_S and IQ1_M on ARM_NEON.

Here is a PP-512 performance comparison between the main branch and this PR for LlaMA-3.1-8B-Instruct on M2-Max

type	t/s (main)	t/s (PR)	Speedup
IQ1_S	66.3	168.8	2.546
IQ1_M	19.0	163.9	8.626

IQ1_M did not have a faster IQK implementation, so the 19 t/s is what one has within the standard ggml GEMM framework.