Move the Host extractor to axum-extra #4941

Job	Run time
cargo-hack	5m 10s
cargo-public-api-crates (axum)	30s
check-docs	24s
cargo-public-api-crates (axum-core)	16s
check	41s
cargo-public-api-crates (axum-extra)	35s
cargo-deny check (advisories)	26s
dependencies-are-sorted	15s
cargo-public-api-crates (axum-macros)	17s
cargo-deny check (bans licenses sources)	23s
Spell Check with Typos	6s
test-msrv	1m 48s
test-nightly	1m 44s
armv5te-unknown-linux-musleabi	47s
test-docs	1m 26s
test-versions (stable)	3m 6s
wasm32-unknown-unknown	18s
test-versions (beta)	1m 10s
	19m 22s

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