[`pylint`] Implement `singledispatchmethod-function` (`PLE5120`) #25864

Job	Run time
cargo fmt	13s
Determine changes	7s
mkdocs	2m 0s
pre-commit	28s
python package	1m 8s
benchmarks	4m 23s
cargo clippy	1m 49s
cargo test (linux)	3m 49s
cargo fuzz	5m 18s
cargo test (wasm)	1m 24s
cargo test (windows)	5m 41s
cargo udeps	1m 56s
formatter instabilities and black similarity	3m 42s
test scripts	50s
test ruff-lsp	21s
ecosystem	14m 31s
	47m 40s

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