Rust

Add example of dataframe API aggregations #1

Job	Run time
cargo test (macos)	8m 22s
cargo check	8m 8s
Check cargo fmt	1m 44s
build with wasm-pack	2m 36s
cargo test (macos-aarch64)	10m 38s
Verify MSRV (Min Supported Rust Version)	6m 3s
Verify Vendored Code	51s
cargo test (win64)	33m 33s
cargo test (amd64)	9m 14s
cargo examples (amd64)	2m 39s
clippy	4m 55s
check Cargo.toml formatting	2m 57s
check configs.md is up-to-date	2m 39s
cargo test hash collisions (amd64)	8m 57s
cargo test datafusion-cli (amd64)	3m 38s
cargo doc	3m 44s
cargo test doc (amd64)	12m 43s
Run sqllogictest with Postgres runner	3m 8s
cargo test pyarrow (amd64)	2m 51s
verify benchmark results (amd64)	10m 48s
	2h 20m 8s

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