Add support for WebSockets over HTTP/2 #4720

Job	Run time
check-docs	43s
check	1m 57s
cargo-hack	1m 40s
cargo-public-api-crates (axum)	39s
dependencies-are-sorted	27s
cargo-public-api-crates (axum-core)	31s
cargo-deny check (advisories)	27s
cargo-public-api-crates (axum-extra)	36s
cargo-public-api-crates (axum-macros)	28s
cargo-deny check (bans licenses sources)	26s
Spell Check with Typos	4s
test-nightly	2m 26s
test-docs	1m 59s
armv5te-unknown-linux-musleabi	1m 0s
test-msrv	6m 14s
test-versions (stable)	3m 18s
wasm32-unknown-unknown	25s
test-versions (beta)	3m 2s
	26m 22s

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