organize ExternalSorter fields (#13447) #35010

Job	Run time
cargo check	8m 46s
build with wasm-pack	2m 50s
Check License Header	2m 21s
Check cargo fmt	1m 14s
cargo test (macos)	11m 4s
cargo test (macos-aarch64)	11m 25s
Verify MSRV (Min Supported Rust Version)	9m 2s
Verify Vendored Code	53s
cargo test (win64)	1h 7m 49s
cargo test datafusion-cli (amd64)	4m 25s
check Cargo.toml formatting	3m 1s
check configs.md and ***_functions.md is up-to-date	3m 25s
cargo test hash collisions (amd64)	17m 41s
clippy	6m 30s
cargo doc	4m 33s
cargo test (amd64)	11m 37s
cargo examples (amd64)	13m 54s
Run sqllogictest with Postgres runner	4m 9s
cargo test pyarrow (amd64)	2m 52s
verify benchmark results (amd64)	13m 13s
cargo test doc (amd64)	16m 28s
	3h 37m 12s

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