Add `axum_extra::json!` #4882

Job	Run time
cargo-hack	3m 42s
check	1m 26s
cargo-public-api-crates (axum)	34s
check-docs	16s
cargo-public-api-crates (axum-core)	23s
cargo-deny check (advisories)	23s
cargo-public-api-crates (axum-extra)	33s
dependencies-are-sorted	18s
Spell Check with Typos	5s
cargo-deny check (bans licenses sources)	23s
cargo-public-api-crates (axum-macros)	14s
test-msrv	2m 2s
armv5te-unknown-linux-musleabi	17s
test-docs	1m 11s
test-nightly	1m 15s
test-versions (stable)	2m 17s
wasm32-unknown-unknown	15s
test-versions (beta)	2m 12s
	17m 46s

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