Rust

Implement `PhysicalExpr` CSE #375

Job	Run time
Check cargo fmt	39s
Check License Header	2m 36s
linux build test	5m 6s
build with wasm-pack	3m 44s
cargo test (macos-aarch64)	8m 15s
Verify Vendored Code	49s
Verify MSRV (Min Supported Rust Version)	7m 59s
check Cargo.toml formatting	3m 57s
check configs.md and ***_functions.md is up-to-date	4m 12s
cargo check datafusion	5m 17s
clippy	5m 46s
cargo check functions	2m 12s
cargo check no default features	8m 55s
cargo doc	4m 9s
cargo test (amd64)	15m 40s
cargo test doc (amd64)	18m 48s
Run sqllogictest with Postgres runner	5m 47s
cargo examples (amd64)	19m 53s
cargo test pyarrow (amd64)	3m 22s
verify benchmark results (amd64)	9m 38s
	2h 16m 44s

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