Rust

Moved dataframe examples to docs on the actual functions and extracte… #17

Job	Run time
build with wasm-pack	2m 7s
cargo test (macos)	28m 26s
cargo check	7m 35s
Check cargo fmt	37s
Verify Vendored Code	54s
Verify MSRV (Min Supported Rust Version)	6m 46s
cargo test (win64)	42m 25s
cargo test (amd64)	9m 13s
clippy	5m 2s
cargo doc	3m 32s
cargo test datafusion-cli (amd64)	3m 22s
cargo test hash collisions (amd64)	8m 35s
cargo test doc (amd64)	10m 42s
cargo examples (amd64)	7m 38s
Run sqllogictest with Postgres runner	3m 7s
cargo test pyarrow (amd64)	2m 22s
verify benchmark results (amd64)	10m 41s
check Cargo.toml formatting	1m 30s
check configs.md is up-to-date	2m 32s
	2h 37m 6s

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