refactor: move std lib build artifacts into OUT_DIR #4083

Job	Run time
rustfmt	17s
Clippy	51s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 28s
Check Rust stable on ubuntu with --all-targets	1m 6s
no-std (stable, wasm32-unknown-unknown)	1m 12s
Test Rust stable on ubuntu with --profile test-release	8m 34s
Check Rust stable on ubuntu with --all-targets --all-features	1m 24s
Test Rust nightly on windows-2022	9m 3s
no-std (nightly, wasm32-unknown-unknown)	1m 26s
Test Rust stable on ubuntu with --profile test-release --doc	5m 4s
Test Rust nightly on ubuntu with --profile test-release	11m 34s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 33s
Test Rust nightly on ubuntu with --profile test-release --doc	5m 7s
Check Rust nightly on ubuntu with --all-targets	1m 5s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 35s
	51m 19s

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