Rust

Remove useless `NodeProto` serializations #1782

Job	Run time
Clippy	23s
Rustfmt	26s
Package onnxruntime-sys	25s
Test Suite (x86_64-unknown-linux-gnu)	24s
Test Suite (x86_64-apple-darwin)	44s
Test Suite (x86_64-pc-windows-msvc)	41s
Test Suite (i686-pc-windows-msvc)	34s
Download prebuilt ONNX Runtime archive from build.rs	24s
	4m 1s

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