add `Created` helper type #5801

Job	Run time
check-docs	28s
check	45s
cargo-public-api-crates (axum)	52s
Spell Check with Typos	6s
cargo-hack	3m 16s
dependencies-are-sorted	4s
cargo-public-api-crates (axum-macros)	42s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-core)	35s
cargo-deny check (advisories)	24s
cargo-public-api-crates (axum-extra)	46s
test-nightly	1m 6s
test-versions (stable)	1m 5s
test-msrv	2m 37s
test-docs	1m 2s
wasm32-unknown-unknown	25s
test-versions (beta)	1m 10s
armv5te-unknown-linux-musleabi	37s
	16m 25s

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