Make tokio an optional dependency of axum-extra (#2236) #3916

Job	Run time
check-docs	1m 18s
cargo-hack	9m 27s
cargo-public-api-crates (axum)	2m 6s
cargo-public-api-crates (axum-core)	1m 13s
check	1m 49s
cargo-deny check (advisories)	29s
dependencies-are-sorted	30s
cargo-public-api-crates (axum-extra)	1m 43s
cargo-deny check (bans licenses sources)	38s
cargo-public-api-crates (axum-macros)	1m 6s
Spell Check with Typos	5s
test-nightly	3m 23s
armv5te-unknown-linux-musleabi	2m 0s
test-msrv	8m 26s
test-docs	4m 7s
test-versions (stable)	7m 2s
wasm32-unknown-unknown	52s
test-versions (beta)	3m 42s
	49m 56s

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