Use `memchr` for tab-indentation detection #24549

Job	Run time
Determine changes	8s
python package	1m 11s
pre-commit	39s
cargo fmt	15s
mkdocs	2m 14s
cargo test (windows)	7m 45s
cargo test (linux)	4m 9s
cargo test (wasm)	1m 10s
cargo clippy	1m 48s
cargo fuzz	5m 17s
cargo udeps	1m 52s
test scripts	48s
benchmarks	6m 11s
formatter instabilities and black similarity	0s
test ruff-lsp	19s
ecosystem	8m 35s
	42m 21s

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