Rust

Add standalone example of using the SQL frontend #28710

Job	Run time
build with wasm-pack	2m 18s
cargo test (macos)	10m 15s
cargo check	8m 2s
Check cargo fmt	40s
cargo test (macos-aarch64)	9m 1s
Verify MSRV (Min Supported Rust Version)	6m 36s
Verify Vendored Code	51s
cargo test (win64)	32m 17s
cargo test datafusion-cli (amd64)	3m 49s
cargo test (amd64)	9m 3s
cargo examples (amd64)	12m 37s
check Cargo.toml formatting	2m 53s
check configs.md is up-to-date	10m 56s
clippy	5m 13s
cargo test hash collisions (amd64)	8m 46s
cargo doc	3m 44s
cargo test doc (amd64)	12m 44s
Run sqllogictest with Postgres runner	3m 15s
cargo test pyarrow (amd64)	2m 37s
verify benchmark results (amd64)	10m 19s
	2h 35m 56s

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