Migrate sys.rs generation to stdlibs #28200

Job	Run time
cargo fmt	21s
Determine changes	12s
mkdocs	2m 4s
pre-commit	28s
python package	1m 11s
cargo fuzz	4m 43s
cargo build (release)	3m 55s
cargo clippy	1m 40s
benchmarks	4m 11s
cargo test (linux)	3m 21s
cargo test (wasm)	1m 6s
cargo test (windows)	6m 20s
cargo udeps	1m 53s
formatter instabilities and black similarity	3m 59s
test scripts	54s
test ruff-lsp	15s
ecosystem	14m 38s
Fuzz the parser	0s
	51m 11s

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