Feat/rust reqwest shallow object query param #619

Job	Run time
Build Rust (samples/client/petstore/rust/)	1m 32s
Build Rust (samples/server/petstore/rust-axum/)	1m 8s
Build Rust (samples/client/others/rust/)	43s
Build Rust (samples/server/petstore/rust-server/)	2m 38s
	6m 1s

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