Add SimpleScalarUDF::new_with_signature #397

Job	Run time
cargo check	13m 3s
build with wasm-pack	2m 49s
Check License Header	2m 18s
Check cargo fmt	40s
cargo test (macos)	13m 34s
cargo test (macos-aarch64)	15m 17s
Verify MSRV (Min Supported Rust Version)	9m 14s
Verify Vendored Code	47s
cargo test (win64)	1h 12m 33s
cargo examples (amd64)	14m 12s
cargo test datafusion-cli (amd64)	4m 18s
cargo doc	4m 47s
cargo test (amd64)	11m 44s
cargo test doc (amd64)	16m 36s
Run sqllogictest with Postgres runner	3m 47s
cargo test pyarrow (amd64)	3m 6s
verify benchmark results (amd64)	13m 20s
check Cargo.toml formatting	2m 55s
clippy	6m 30s
check configs.md and ***_functions.md is up-to-date	3m 25s
cargo test hash collisions (amd64)	29m 6s
	4h 4m 1s

Provide feedback