Rust

Remove unnecessary qualified names #26

Job	Run time
cargo check	8m 12s
build with wasm-pack	2m 16s
cargo test (macos)	9m 40s
cargo test (macos-aarch64)	8m 49s
Verify Vendored Code	53s
cargo test (win64)	33m 20s
Check cargo fmt	36s
Verify MSRV (Min Supported Rust Version)	6m 24s
cargo test (amd64)	9m 37s
cargo test datafusion-cli (amd64)	4m 36s
cargo doc	4m 47s
cargo test hash collisions (amd64)	8m 29s
cargo test doc (amd64)	12m 32s
cargo examples (amd64)	3m 4s
Run sqllogictest with Postgres runner	3m 30s
cargo test pyarrow (amd64)	2m 38s
verify benchmark results (amd64)	10m 38s
check Cargo.toml formatting	3m 38s
check configs.md is up-to-date	3m 18s
clippy	5m 23s
	2h 22m 20s

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