Add ability to set read_buffer_size for websockets #5258

Job	Run time
cargo-hack	3m 1s
check-docs	26s
cargo-public-api-crates (axum)	37s
check	42s
cargo-public-api-crates (axum-core)	19s
cargo-deny check (advisories)	26s
dependencies-are-sorted	13s
cargo-public-api-crates (axum-extra)	30s
cargo-deny check (bans licenses sources)	23s
cargo-public-api-crates (axum-macros)	20s
Spell Check with Typos	6s
test-docs	1m 26s
test-nightly	1m 6s
armv5te-unknown-linux-musleabi	29s
test-msrv	2m 3s
test-versions (stable)	1m 20s
wasm32-unknown-unknown	18s
test-versions (beta)	1m 13s
	14m 58s

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