Implement `FromRequestParts` for `Parts` and `Extensions` (#2328) #4035

Job	Run time
check-docs	26s
cargo-public-api-crates (axum)	35s
cargo-hack	2m 50s
cargo-public-api-crates (axum-core)	23s
check	42s
cargo-deny check (advisories)	26s
cargo-public-api-crates (axum-extra)	33s
cargo-deny check (bans licenses sources)	22s
cargo-public-api-crates (axum-macros)	15s
dependencies-are-sorted	17s
Spell Check with Typos	4s
test-versions (stable)	2m 1s
test-msrv	1m 21s
armv5te-unknown-linux-musleabi	30s
test-versions (beta)	1m 47s
test-docs	1m 40s
test-nightly	1m 36s
wasm32-unknown-unknown	19s
	16m 7s

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