Add utility function to convert body into bytes (#2373) #4115

Job	Run time
check-docs	21s
check	44s
cargo-hack	3m 10s
cargo-public-api-crates (axum)	33s
cargo-public-api-crates (axum-core)	36s
cargo-deny check (advisories)	27s
Spell Check with Typos	7s
cargo-deny check (bans licenses sources)	22s
cargo-public-api-crates (axum-extra)	32s
dependencies-are-sorted	15s
cargo-public-api-crates (axum-macros)	19s
test-msrv	1m 18s
test-nightly	1m 46s
test-docs	1m 43s
armv5te-unknown-linux-musleabi	35s
test-versions (stable)	2m 21s
wasm32-unknown-unknown	24s
test-versions (beta)	1m 54s
	17m 27s

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