Rust

move serialization to blocking threadpool #258

Job	Run time
cargo check	9m 45s
build with wasm-pack	2m 28s
cargo test (macos)	19m 46s
cargo test (win64)	43m 33s
Check cargo fmt	54s
cargo test (macos-aarch64)	10m 15s
Verify Vendored Code	55s
Verify MSRV (Min Supported Rust Version)	7m 17s
cargo test datafusion-cli (amd64)	3m 32s
cargo test doc (amd64)	12m 44s
cargo examples (amd64)	10m 16s
cargo test (amd64)	11m 1s
check configs.md is up-to-date	2m 28s
check Cargo.toml formatting	2m 57s
clippy	5m 50s
cargo test hash collisions (amd64)	10m 24s
cargo doc	4m 6s
Run sqllogictest with Postgres runner	3m 35s
cargo test pyarrow (amd64)	2m 30s
verify benchmark results (amd64)	10m 46s
	2h 55m 2s

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