Rust

add fast-path for `with_new_children` #42

Job	Run time
cargo test (macos-aarch64)	20m 15s
Verify Vendored Code	1m 34s
build and run with wasm-pack	5m 2s
linux build test	3m 47s
Check cargo fmt	1m 12s
Verify MSRV (Min Supported Rust Version)	4m 50s
cargo test doc (amd64)	8m 2s
cargo test (amd64)	9m 58s
Run sqllogictest in Substrait round-trip mode	6m 35s
cargo doc	5m 9s
cargo check datafusion features	10m 52s
cargo test datafusion-cli (amd64)	4m 11s
check example README is up-to-date	38s
cargo check datafusion-functions features	2m 23s
cargo check datafusion-proto features	4m 52s
clippy	4m 59s
check Cargo.toml formatting	3m 23s
cargo examples (amd64)	8m 19s
cargo check datafusion-common features	1m 56s
Run sqllogictest with Postgres runner	6m 16s
cargo check datafusion-substrait features	10m 18s
check configs.md and ***_functions.md is up-to-date	5m 12s
verify benchmark results (amd64)	10m 33s
	2h 20m 16s

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