Implement the OptionalFromRequestParts trait for the Host extractor #5272

Job	Run time
check-docs	19s
check	2m 9s
cargo-hack	2m 48s
cargo-public-api-crates (axum)	52s
cargo-public-api-crates (axum-core)	36s
cargo-deny check (advisories)	24s
dependencies-are-sorted	34s
cargo-public-api-crates (axum-extra)	47s
Spell Check with Typos	4s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-macros)	37s
armv5te-unknown-linux-musleabi	25s
test-docs	1m 28s
test-nightly	1m 14s
test-msrv	2m 37s
test-versions (stable)	1m 14s
wasm32-unknown-unknown	16s
test-versions (beta)	3m 52s
	20m 41s

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