fixup: src: introduce quant_entry_t and refactor arg_scales_t to rely on it #1963

Job	Run time
build-acl-cache / MacOS, clang, SEQ, Release	15s
build-acl-cache / cb100, gcc, OMP, Release	13s
build-acl-cache / c6g, clang, OMP, Debug	15s
build-acl-cache / c6g, gcc, OMP, Release	12s
MacOS, clang, SEQ, Release	35m 36s
cb100, gcc, OMP, Release	18m 21s
c6g, gcc, OMP, Release	1h 6m 42s
c6g, clang, OMP, Debug	42m 11s
c7g, gcc, OMP, Release	41m 19s
CI AArch64	1s
	3h 25m 5s

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