Better multi-column aggregation support with StringView #30014

Job	Run time
cargo check	4m 7s
build with wasm-pack	2m 20s
cargo test (macos)	6m 24s
cargo test (macos-aarch64)	5m 59s
cargo test (win64)	18m 18s
Check cargo fmt	44s
Verify MSRV (Min Supported Rust Version)	6m 26s
Verify Vendored Code	48s
cargo test (amd64)	8m 1s
cargo test datafusion-cli (amd64)	3m 41s
check Cargo.toml formatting	2m 48s
clippy	5m 13s
cargo test hash collisions (amd64)	12m 31s
cargo doc	3m 47s
cargo test doc (amd64)	14m 9s
cargo examples (amd64)	12m 52s
Run sqllogictest with Postgres runner	3m 21s
cargo test pyarrow (amd64)	2m 52s
verify benchmark results (amd64)	11m 15s
check configs.md is up-to-date	2m 33s
	2h 8m 9s

Provide feedback