Rust

Update substrait requirement from 0.42 to 0.50 #508

Job	Run time
Check cargo fmt	50s
cargo check	43s
build with wasm-pack	38s
cargo test (macos)	18s
cargo test (macos-aarch64)	16s
Verify MSRV (Min Supported Rust Version)	5m 3s
Verify Vendored Code	31s
cargo test (win64)	1m 7s
check configs.md and ***_functions.md is up-to-date	0s
check Cargo.toml formatting	0s
clippy	0s
cargo test hash collisions (amd64)	0s
cargo doc	0s
cargo test datafusion-cli (amd64)	0s
cargo test (amd64)	0s
cargo test doc (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo examples (amd64)	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
	9m 26s

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