Add OptionalQuery extractor (#2310) #4012

Job	Run time
check	48s
check-docs	44s
dependencies-are-sorted	14s
cargo-hack	3m 4s
cargo-deny check (advisories)	22s
cargo-public-api-crates (axum)	29s
Spell Check with Typos	4s
cargo-deny check (bans licenses sources)	21s
cargo-public-api-crates (axum-core)	13s
cargo-public-api-crates (axum-extra)	30s
cargo-public-api-crates (axum-macros)	19s
test-nightly	2m 14s
test-docs	1m 53s
test-msrv	1m 28s
armv5te-unknown-linux-musleabi	32s
test-versions (stable)	2m 12s
wasm32-unknown-unknown	19s
test-versions (beta)	2m 12s
	17m 58s

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