Rust

Adds slt file #7

Job	Run time
Verify MSRV (Min Supported Rust Version)	5m 8s
Verify Vendored Code	1m 32s
linux build test	2m 36s
cargo test (macos-aarch64)	6m 38s
build and run with wasm-pack	5m 2s
Check cargo fmt	1m 24s
cargo check datafusion-functions features	-1s
cargo check datafusion features	-1s
check configs.md and ***_functions.md is up-to-date	-1s
check Cargo.toml formatting	0s
cargo test doc (amd64)	-1s
cargo check datafusion-substrait features	-1s
cargo test (amd64)	-1s
verify benchmark results (amd64)	-1s
Run sqllogictest in Substrait round-trip mode	-1s
cargo examples (amd64)	0s
check example README is up-to-date	-1s
cargo check datafusion-proto features	-1s
Run sqllogictest with Postgres runner	-1s
cargo test datafusion-cli (amd64)	-1s
cargo doc	-1s
cargo check datafusion-common features	-1s
clippy	0s
	22m 6s

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