Add an encapsulated file stream in axum-extra to make it more conveni… #5078

Job	Run time
cargo-hack	3m 27s
check-docs	27s
check	59s
cargo-public-api-crates (axum)	33s
cargo-deny check (advisories)	57s
cargo-public-api-crates (axum-core)	17s
dependencies-are-sorted	15s
Spell Check with Typos	4s
cargo-deny check (bans licenses sources)	28s
cargo-public-api-crates (axum-extra)	26s
cargo-public-api-crates (axum-macros)	1m 56s
test-versions (stable)	1m 49s
test-msrv	1m 53s
test-versions (beta)	1m 58s
test-docs	1m 27s
armv5te-unknown-linux-musleabi	36s
test-nightly	1m 15s
wasm32-unknown-unknown	19s
	19m 6s

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