simdstring: add not_index_byte and not_index_byte2 functions #12237

Job	Run time
Linux package	4m 31s
Bundle test (macos-latest)	2m 23s
Test ./dev.sh and benchmark	2m 6s
Bundle test (ubuntu-latest)	2m 3s
macOS Brew	4m 40s
Linux (python=3.11 cc=gcc sanitize=1)	1m 54s
Linux (python=3.12 cc=clang sanitize=1)	2m 32s
Linux (python=3.10 cc=gcc sanitize=0)	1m 49s
	21m 58s

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