Implement isort's `default-section` setting #25218

Job	Run time
pre-commit	48s
mkdocs	1m 56s
cargo fmt	14s
Determine changes	7s
python package	1m 18s
cargo fuzz	5m 11s
cargo test (linux)	3m 38s
benchmarks	4m 25s
cargo clippy	1m 48s
cargo test (wasm)	1m 16s
cargo test (windows)	6m 13s
cargo udeps	1m 56s
formatter instabilities and black similarity	3m 33s
test scripts	57s
test ruff-lsp	17s
ecosystem	13m 49s
	47m 26s

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