Rust

- refactor `EnforceDistribution` using `transform_down_with_payload()` #12

Job	Run time
cargo check	2m 16s
cargo test (mac)	28m 31s
build with wasm-pack	1m 53s
Check cargo fmt	44s
Verify Vendored Code	49s
cargo test (win64)	27m 35s
Verify MSRV	6m 26s
cargo test datafusion-cli (amd64)	2m 58s
cargo examples (amd64)	6m 21s
clippy	3m 13s
cargo test hash collisions (amd64)	8m 42s
cargo doc	3m 18s
cargo test (amd64)	8m 53s
cargo test doc (amd64)	9m 35s
Run sqllogictest with Postgres runner	3m 5s
cargo test pyarrow (amd64)	2m 17s
verify benchmark results (amd64)	9m 26s
check Cargo.toml formatting	1m 13s
check configs.md is up-to-date	2m 34s
	2h 9m 49s

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