ggml-cpu : split arch-specific implementations (llama/13892)

ggml-cpu : split arch-specific implementations (llama/13892)

* move ggml-cpu-aarch64 to repack

* split quantize_row_q8_0/1

* split helper functions

* split ggml_vec_dot_q4_0_q8_0

* split ggml_vec_dot_q4_1_q8_1

* split ggml_vec_dot_q5_0_q8_0

* split ggml_vec_dot_q5_1_q8_1

* split ggml_vec_dot_q8_0_q8_0

* split ggml_vec_dot_tq1_0_q8_K

* split ggml_vec_dot_tq2_0_q8_K

* split ggml_vec_dot_q2_K_q8_K

* split ggml_vec_dot_q3_K_q8_K

* split ggml_vec_dot_q4_K_q8_K

* split ggml_vec_dot_q5_K_q8_K

* split ggml_vec_dot_q6_K_q8_K

* split ggml_vec_dot_iq2_xxs_q8_K

* split ggml_vec_dot_iq2_xs_q8_K

* split ggml_vec_dot_iq2_s_q8_K

* split ggml_vec_dot_iq3_xxs_q8_K

* split ggml_vec_dot_iq3_s_q8_K

* split ggml_vec_dot_iq1_s_q8_K

* split ggml_vec_dot_iq1_m_q8_K

* split ggml_vec_dot_iq4_nl_q8_0

* split ggml_vec_dot_iq4_xs_q8_K

* fix typos

* fix missing prototypes

* rename ggml-cpu-quants.c

* rename ggml-cpu-traits

* rename arm folder

* move cpu-feats-x86.cpp

* rename ggml-cpu-hbm

* update arm detection macro in quants.c

* move iq quant tables

* split ggml_quantize_mat_q8_0/K

* split ggml_gemv_*

* split ggml_gemm_*

* rename namespace aarch64 to repack

* use weak aliases to replace test macros

* rename GGML_CPU_AARCH64 to GGML_CPU_REPACK

* rename more aarch64 to repack

* clean up rebase leftover

* fix compilation errors

* remove trailing spaces

* try to fix clang compilation errors

* try to fix clang compilation errors again

* try to fix clang compilation errors, 3rd attempt

* try to fix clang compilation errors, 4th attempt

* try to fix clang compilation errors, 5th attempt

* try to fix clang compilation errors, 6th attempt

* try to fix clang compilation errors, 7th attempt

* try to fix clang compilation errors, 8th attempt

* try to fix clang compilation errors, 9th attempt

* more cleanup

* fix compilation errors

* fix apple targets

* fix a typo in arm version of ggml_vec_dot_q4_K_q8_K

Co-authored-by: Georgi Gerganov <redacted>
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Co-authored-by: Georgi Gerganov <redacted>