[`refurb`] Implement `bit-count` (`FURB161`) #22994

Job	Run time
mkdocs	1m 54s
Determine changes	8s
cargo fmt	11s
pre-commit	30s
python package	1m 5s
benchmarks	6m 21s
cargo test (linux)	3m 40s
cargo fuzz	3m 41s
cargo clippy	1m 54s
cargo test (wasm)	1m 14s
cargo test (windows)	5m 40s
cargo udeps	1m 57s
formatter instabilities and black similarity	0s
test scripts	55s
test ruff-lsp	21s
ecosystem	7m 44s
	37m 15s

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