Add model name mapping option to rust generators #604

Job	Run time
Build Rust (samples/client/petstore/rust/)	14s
Build Rust (samples/server/petstore/rust-server/)	2m 16s
Build Rust (samples/server/petstore/rust-axum/)	59s
Build Rust (samples/client/others/rust/)	40s
	4m 9s

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