Rust

add fast-path for `with_new_children` #55

Job	Run time
build and run with wasm-pack	5m 3s
linux build test	4m 26s
Verify Vendored Code	1m 14s
Verify MSRV (Min Supported Rust Version)	4m 59s
cargo test (macos-aarch64)	15m 29s
Check cargo fmt	1m 43s
cargo test datafusion-cli (amd64)	4m 14s
cargo check datafusion-substrait features	10m 23s
cargo check datafusion-proto features	4m 22s
cargo check datafusion-functions features	2m 26s
cargo check datafusion-common features	1m 54s
cargo test (amd64)	10m 18s
cargo examples (amd64)	12m 10s
check configs.md and ***_functions.md is up-to-date	5m 1s
Run sqllogictest with Postgres runner	6m 14s
check Cargo.toml formatting	3m 37s
verify benchmark results (amd64)	10m 33s
cargo check datafusion features	11m 19s
cargo test doc (amd64)	8m 21s
Run sqllogictest in Substrait round-trip mode	5m 53s
cargo doc	4m 46s
check example README is up-to-date	35s
clippy	4m 38s
	2h 19m 38s

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