Add Scheme extractor #4971

Job	Run time
check	2m 21s
check-docs	31s
cargo-hack	5m 25s
cargo-public-api-crates (axum)	30s
dependencies-are-sorted	36s
cargo-public-api-crates (axum-core)	20s
cargo-deny check (advisories)	27s
cargo-deny check (bans licenses sources)	26s
cargo-public-api-crates (axum-extra)	27s
Spell Check with Typos	4s
cargo-public-api-crates (axum-macros)	17s
test-msrv	2m 32s
test-nightly	1m 31s
armv5te-unknown-linux-musleabi	1m 0s
test-docs	1m 32s
test-versions (stable)	2m 49s
wasm32-unknown-unknown	23s
test-versions (beta)	3m 52s
	25m 3s

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