Implement pylint import-outside-toplevel rule (C0415) #20958

Job	Run time
cargo fmt	18s
cargo clippy	2m 48s
cargo fuzz	6m 29s
benchmarks	12m 53s
cargo test (linux)	6m 29s
cargo test (wasm)	1m 36s
cargo test (windows)	7m 38s
cargo udeps	3m 8s
Determine changes	12s
mkdocs	1m 50s
pre-commit	2m 1s
python package	1m 55s
test scripts	1m 1s
formatter instabilities and black similarity	0s
ecosystem	5m 53s
test ruff-lsp	31s
	54m 42s

Provide feedback