Rust

Remove unnecessary qualified names #27

Job	Run time
build with wasm-pack	3m 32s
Check cargo fmt	43s
cargo test (macos)	11m 32s
cargo test (macos-aarch64)	10m 34s
Verify MSRV (Min Supported Rust Version)	7m 7s
Verify Vendored Code	1m 10s
cargo test (win64)	34m 7s
cargo check	8m 50s
cargo examples (amd64)	12m 23s
cargo test datafusion-cli (amd64)	3m 35s
check Cargo.toml formatting	2m 49s
clippy	5m 22s
check configs.md is up-to-date	2m 46s
cargo test hash collisions (amd64)	8m 39s
cargo doc	3m 57s
cargo test (amd64)	9m 2s
cargo test doc (amd64)	12m 53s
Run sqllogictest with Postgres runner	3m 13s
cargo test pyarrow (amd64)	2m 42s
verify benchmark results (amd64)	10m 38s
	2h 35m 34s

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