wip: Convert `BuiltInWindowFunction::{Lead, Lag}` to a user defined window function #33317

Job	Run time
Check cargo fmt	49s
cargo check	10m 38s
build with wasm-pack	2m 43s
cargo test (macos)	7m 41s
cargo test (macos-aarch64)	7m 33s
Verify Vendored Code	6h 0m 2s
Verify MSRV (Min Supported Rust Version)	8m 18s
cargo test (win64)	30m 24s
cargo test (amd64)	9m 48s
cargo test doc (amd64)	15m 39s
cargo test datafusion-cli (amd64)	4m 9s
cargo doc	3m 58s
cargo examples (amd64)	14m 4s
Run sqllogictest with Postgres runner	3m 51s
cargo test pyarrow (amd64)	3m 2s
verify benchmark results (amd64)	12m 57s
check Cargo.toml formatting	2m 47s
clippy	5m 35s
check configs.md and ***_functions.md is up-to-date	3m 0s
cargo test hash collisions (amd64)	16m 33s
	8h 43m 31s

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