feat(function): add greatest function #32321

Job	Run time
cargo check	6m 44s
build with wasm-pack	2m 37s
Check cargo fmt	39s
cargo test (macos)	12m 13s
cargo test (macos-aarch64)	11m 45s
Verify MSRV (Min Supported Rust Version)	6m 56s
Verify Vendored Code	58s
cargo test (win64)	47m 3s
cargo examples (amd64)	13m 28s
cargo test (amd64)	10m 11s
clippy	2m 9s
cargo test hash collisions (amd64)	14m 55s
cargo doc	4m 1s
cargo test datafusion-cli (amd64)	4m 5s
cargo test doc (amd64)	14m 44s
Run sqllogictest with Postgres runner	3m 41s
verify benchmark results (amd64)	13m 0s
cargo test pyarrow (amd64)	3m 7s
check Cargo.toml formatting	3m 2s
check configs.md is up-to-date	3m 0s
	2h 58m 18s

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