Add a new `Binding::is_unused` method #31513

Job	Run time
cargo fmt	16s
Determine changes	8s
mkdocs	2m 25s
pre-commit	30s
python package	1m 12s
cargo clippy	1m 44s
benchmarks	4m 48s
cargo build (release)	4m 27s
cargo build (msrv)	3m 21s
cargo fuzz	4m 36s
cargo shear	23s
cargo test (linux)	3m 52s
cargo test (wasm)	1m 25s
cargo test (windows)	8m 9s
test scripts	58s
formatter instabilities and black similarity	0s
ecosystem	8m 44s
test ruff-lsp	21s
Fuzz the parser	0s
	47m 19s

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