Add Dictionary String (UTF8) type to String sqllogictests #32666

Job	Run time
build with wasm-pack	2m 30s
cargo check	7m 16s
Check cargo fmt	50s
cargo test (macos)	12m 4s
cargo test (macos-aarch64)	11m 4s
Verify MSRV (Min Supported Rust Version)	7m 5s
Verify Vendored Code	1m 13s
cargo test (win64)	46m 32s
cargo test datafusion-cli (amd64)	4m 0s
clippy	5m 55s
cargo test (amd64)	10m 4s
cargo doc	3m 59s
cargo test doc (amd64)	15m 49s
cargo examples (amd64)	13m 45s
cargo test pyarrow (amd64)	3m 0s
Run sqllogictest with Postgres runner	3m 38s
verify benchmark results (amd64)	12m 50s
check Cargo.toml formatting	3m 3s
check configs.md is up-to-date	2m 54s
cargo test hash collisions (amd64)	15m 9s
	3h 2m 40s

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