Rust

unify cast_to function of ScalarValue #85

Job	Run time
build with wasm-pack	2m 40s
cargo check	11m 5s
Check cargo fmt	41s
cargo test (macos)	10m 7s
cargo test (macos-aarch64)	10m 9s
Verify MSRV (Min Supported Rust Version)	8m 19s
Verify Vendored Code	36s
cargo test (win64)	1h 7m 11s
cargo examples (amd64)	13m 38s
cargo test datafusion-cli (amd64)	4m 22s
cargo test (amd64)	10m 47s
cargo doc	4m 27s
clippy	5m 32s
cargo test hash collisions (amd64)	17m 12s
cargo test doc (amd64)	15m 29s
Run sqllogictest with Postgres runner	3m 33s
cargo test pyarrow (amd64)	3m 0s
verify benchmark results (amd64)	12m 28s
check Cargo.toml formatting	3m 9s
check configs.md and ***_functions.md is up-to-date	3m 17s
	3h 27m 42s

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