Add an Attachment type to axum-extra #4600

Job	Run time
check-docs	29s
cargo-public-api-crates (axum)	36s
cargo-hack	3m 40s
check	1m 27s
cargo-public-api-crates (axum-core)	23s
cargo-public-api-crates (axum-extra)	29s
cargo-deny check (advisories)	27s
cargo-public-api-crates (axum-macros)	22s
cargo-deny check (bans licenses sources)	24s
dependencies-are-sorted	13s
Spell Check with Typos	6s
test-docs	1m 59s
test-nightly	1m 43s
test-versions (stable)	2m 29s
test-msrv	2m 31s
armv5te-unknown-linux-musleabi	48s
test-versions (beta)	2m 17s
wasm32-unknown-unknown	25s
	20m 48s

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