Rust

Add basic support for `unnest` unparsing (#13129) #817

Job	Run time
Check cargo fmt	37s
cargo check	10m 55s
build with wasm-pack	2m 46s
cargo test (macos)	11m 59s
cargo test (macos-aarch64)	12m 38s
Verify MSRV (Min Supported Rust Version)	8m 35s
Verify Vendored Code	52s
cargo test (win64)	1h 4m 8s
cargo test (amd64)	11m 12s
cargo examples (amd64)	13m 46s
cargo test hash collisions (amd64)	17m 34s
cargo doc	4m 16s
clippy	5m 33s
cargo test datafusion-cli (amd64)	3m 52s
cargo test doc (amd64)	15m 45s
Run sqllogictest with Postgres runner	3m 38s
cargo test pyarrow (amd64)	3m 2s
verify benchmark results (amd64)	12m 49s
check Cargo.toml formatting	3m 1s
check configs.md and ***_functions.md is up-to-date	3m 7s
	3h 30m 5s

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