Add Scheme extractor #4411

Job	Run time
check-docs	14s
check	56s
cargo-hack	3m 58s
cargo-public-api-crates (axum)	1m 0s
cargo-public-api-crates (axum-core)	48s
cargo-deny check (advisories)	26s
cargo-public-api-crates (axum-extra)	57s
Spell Check with Typos	6s
dependencies-are-sorted	17s
cargo-deny check (bans licenses sources)	23s
cargo-public-api-crates (axum-macros)	50s
armv5te-unknown-linux-musleabi	27s
test-msrv	7m 12s
test-nightly	1m 49s
test-docs	1m 28s
test-versions (stable)	1m 50s
wasm32-unknown-unknown	15s
test-versions (beta)	1m 59s
	24m 55s

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