Add example showing how to proxy `reqwest::Response` (#2138) #3794

Job	Run time
check	1m 17s
check-docs	47s
cargo-deny check (advisories)	32s
cargo-deny check (bans licenses sources)	35s
cargo-public-api-crates (axum)	51s
cargo-public-api-crates (axum-core)	37s
cargo-public-api-crates (axum-extra)	55s
cargo-public-api-crates (axum-macros)	30s
dependencies-are-sorted	27s
cargo-hack	4m 50s
test-docs	3m 1s
test-nightly	2m 48s
armv5te-unknown-linux-musleabi	53s
test-msrv	2m 15s
test-versions (stable)	3m 21s
test-versions (beta)	2m 37s
wasm32-unknown-unknown	33s
	26m 49s

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