Rust

move Left, Lpad, Reverse, Right, Rpad functions to datafusion_functions #88

Job	Run time
cargo check	9m 28s
cargo test (win64)	45m 8s
build with wasm-pack	2m 30s
Check cargo fmt	44s
cargo test (macos)	31m 34s
cargo test (macos-aarch64)	10m 41s
Verify Vendored Code	55s
Verify MSRV (Min Supported Rust Version)	7m 7s
cargo test hash collisions (amd64)	10m 34s
check configs.md is up-to-date	3m 29s
clippy	6m 38s
check Cargo.toml formatting	3m 59s
cargo doc	4m 52s
cargo test (amd64)	10m 52s
cargo test datafusion-cli (amd64)	4m 16s
cargo test doc (amd64)	13m 44s
cargo examples (amd64)	11m 21s
Run sqllogictest with Postgres runner	4m 43s
verify benchmark results (amd64)	11m 51s
cargo test pyarrow (amd64)	3m 18s
	3h 17m 44s

Provide feedback