Rust

Fix: handle NULL input in lead/lag window function #57

Job	Run time
cargo test (macos)	10m 20s
build with wasm-pack	2m 38s
cargo check	6m 17s
Check cargo fmt	35s
cargo test (macos-aarch64)	10m 28s
Verify MSRV (Min Supported Rust Version)	9m 11s
Verify Vendored Code	41s
cargo test (win64)	1h 2m 23s
clippy	5m 42s
check Cargo.toml formatting	2m 56s
check configs.md and ***_functions.md is up-to-date	2m 52s
cargo test hash collisions (amd64)	17m 7s
cargo doc	3m 34s
cargo test (amd64)	10m 51s
cargo test datafusion-cli (amd64)	4m 1s
cargo test doc (amd64)	15m 15s
cargo examples (amd64)	13m 52s
Run sqllogictest with Postgres runner	3m 39s
verify benchmark results (amd64)	12m 28s
cargo test pyarrow (amd64)	2m 52s
	3h 17m 42s

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