feature: add `get_route_paths` to `path_router` #5215

Job	Run time
check	2m 16s
cargo-hack	6m 10s
cargo-public-api-crates (axum)	52s
check-docs	31s
cargo-deny check (advisories)	24s
dependencies-are-sorted	35s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-core)	36s
Spell Check with Typos	3s
cargo-public-api-crates (axum-extra)	51s
cargo-public-api-crates (axum-macros)	39s
test-msrv	2m 40s
test-docs	2m 11s
test-versions (stable)	3m 53s
test-nightly	1m 44s
test-versions (beta)	4m 0s
armv5te-unknown-linux-musleabi	56s
wasm32-unknown-unknown	12s
	28m 58s

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