Add alternative syntax for extract, trim and substring. #294

Job	Run time
cargo check	7m 11s
build with wasm-pack	2m 35s
cargo test (win64)	1h 8m 0s
Check cargo fmt	42s
cargo test (macos)	11m 26s
cargo test (macos-aarch64)	12m 17s
Verify MSRV (Min Supported Rust Version)	8m 3s
Verify Vendored Code	54s
check Cargo.toml formatting	2m 56s
clippy	5m 36s
check configs.md and ***_functions.md is up-to-date	3m 8s
cargo test hash collisions (amd64)	17m 56s
cargo doc	4m 12s
cargo test (amd64)	11m 2s
cargo test datafusion-cli (amd64)	3m 52s
cargo test doc (amd64)	15m 32s
cargo examples (amd64)	14m 9s
Run sqllogictest with Postgres runner	3m 39s
cargo test pyarrow (amd64)	2m 59s
verify benchmark results (amd64)	12m 28s
	3h 28m 37s

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