Implement the OptionalFromRequestParts trait for the Host extractor #5271

Job	Run time
check	2m 16s
check-docs	18s
cargo-hack	3m 4s
cargo-deny check (advisories)	25s
cargo-public-api-crates (axum)	57s
Spell Check with Typos	6s
cargo-deny check (bans licenses sources)	26s
dependencies-are-sorted	36s
cargo-public-api-crates (axum-core)	36s
cargo-public-api-crates (axum-extra)	46s
cargo-public-api-crates (axum-macros)	37s
armv5te-unknown-linux-musleabi	36s
test-msrv	2m 44s
test-docs	1m 28s
test-nightly	1m 13s
test-versions (stable)	1m 22s
wasm32-unknown-unknown	18s
test-versions (beta)	3m 52s
	21m 40s

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