Avoid RowConverter for multi column grouping (10% faster clickbench queries) #32607

Job	Run time
Check cargo fmt	30s
build with wasm-pack	2m 40s
cargo check	5m 50s
cargo test (macos)	9m 47s
cargo test (macos-aarch64)	9m 54s
Verify MSRV (Min Supported Rust Version)	6m 41s
Verify Vendored Code	50s
cargo test (win64)	47m 40s
cargo test datafusion-cli (amd64)	3m 58s
cargo test hash collisions (amd64)	14m 50s
cargo doc	3m 52s
clippy	5m 27s
cargo test (amd64)	10m 2s
cargo test doc (amd64)	15m 17s
cargo examples (amd64)	13m 40s
Run sqllogictest with Postgres runner	3m 33s
cargo test pyarrow (amd64)	2m 57s
verify benchmark results (amd64)	12m 1s
check Cargo.toml formatting	3m 0s
check configs.md is up-to-date	2m 52s
	2h 55m 21s

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