Add `axum_extra::json!` #4884

Job	Run time
check-docs	14s
check	1m 20s
cargo-hack	3m 43s
cargo-public-api-crates (axum)	30s
cargo-public-api-crates (axum-core)	19s
cargo-deny check (advisories)	29s
cargo-public-api-crates (axum-extra)	26s
cargo-deny check (bans licenses sources)	26s
dependencies-are-sorted	18s
cargo-public-api-crates (axum-macros)	20s
Spell Check with Typos	4s
test-msrv	2m 4s
test-versions (stable)	2m 17s
test-nightly	1m 16s
test-docs	1m 19s
test-versions (beta)	2m 13s
armv5te-unknown-linux-musleabi	21s
wasm32-unknown-unknown	14s
	17m 53s

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