Add model name mapping option to rust generators #605

Job	Run time
Build Rust (samples/server/petstore/rust-axum/)	1m 0s
Build Rust (samples/client/others/rust/)	31s
Build Rust (samples/client/petstore/rust/)	52s
Build Rust (samples/server/petstore/rust-server/)	2m 19s
	4m 42s

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