Introduce `StringLike` enum #22446

Job	Run time
Determine changes	7s
pre-commit	23s
cargo fmt	13s
mkdocs	3m 31s
python package	1m 18s
benchmarks	12m 17s
cargo fuzz	5m 39s
cargo test (linux)	6m 35s
cargo clippy	3m 35s
cargo test (wasm)	1m 6s
cargo udeps	1m 49s
cargo test (windows)	7m 50s
formatter instabilities and black similarity	5m 1s
test scripts	47s
ecosystem	11m 20s
test ruff-lsp	15s
	1h 1m 46s

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