Rust

Wrap immutable plan parts into Arc #61

Job	Run time
linux build test	4m 18s
Check cargo fmt	1m 8s
build and run with wasm-pack	5m 28s
Verify MSRV (Min Supported Rust Version)	4m 28s
Verify Vendored Code	1m 19s
cargo test (macos-aarch64)	9m 28s
cargo check datafusion-proto features	4m 31s
cargo check datafusion-common features	1m 55s
cargo check datafusion-functions features	2m 32s
cargo test (amd64)	10m 55s
cargo test doc (amd64)	8m 5s
cargo check datafusion features	11m 9s
cargo check datafusion-substrait features	10m 25s
cargo doc	4m 56s
Run sqllogictest with Postgres runner	6m 25s
check example README is up-to-date	1m 13s
Run sqllogictest in Substrait round-trip mode	6m 17s
clippy	4m 39s
check configs.md and ***_functions.md is up-to-date	5m 6s
cargo examples (amd64)	12m 33s
check Cargo.toml formatting	4m 7s
cargo test datafusion-cli (amd64)	4m 22s
verify benchmark results (amd64)	10m 35s
	2h 15m 54s

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