Rust

Add unit tests #17

Job	Run time
cargo check	5m 6s
Check cargo fmt	46s
cargo test (macos)	10m 10s
build with wasm-pack	2m 51s
cargo test (macos-aarch64)	11m 29s
Verify MSRV (Min Supported Rust Version)	6m 42s
Verify Vendored Code	1m 0s
cargo test (win64)	35m 30s
cargo examples (amd64)	13m 27s
cargo test (amd64)	10m 22s
cargo test datafusion-cli (amd64)	3m 42s
check Cargo.toml formatting	2m 56s
clippy	2m 15s
check configs.md is up-to-date	2m 53s
cargo test hash collisions (amd64)	9m 13s
cargo doc	3m 39s
cargo test doc (amd64)	13m 20s
Run sqllogictest with Postgres runner	3m 20s
cargo test pyarrow (amd64)	3m 1s
verify benchmark results (amd64)	11m 11s
	2h 32m 53s

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