Rust

refactor: wrap HigherOrderUDFImpl in a concrete HigherOrderUDF struct #591

Job	Run time
Verify MSRV (Min Supported Rust Version)	2m 19s
cargo test (macos-aarch64)	2m 22s
Check cargo fmt	2m 7s
build and run with wasm-pack	1m 22s
linux build test	2m 35s
Verify Vendored Code	1m 31s
cargo examples (amd64)	0s
verify benchmark results (amd64)	0s
cargo test (amd64)	0s
cargo check datafusion-proto features	0s
Run sqllogictest in Substrait round-trip mode	0s
check Cargo.toml formatting	0s
clippy	0s
cargo doc	0s
cargo test datafusion-cli (amd64)	-1s
Run sqllogictest with Postgres runner	-1s
cargo test doc (amd64)	-1s
cargo check datafusion features	-1s
cargo check datafusion-common features	-1s
check configs.md and ***_functions.md is up-to-date	-1s
cargo check datafusion-substrait features	-1s
check example README is up-to-date	-1s
cargo check datafusion-functions features	-1s
	12m 7s

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