Rust

Implement `PhysicalExpr` CSE #373

Job	Run time
Check cargo fmt	37s
Check License Header	2m 31s
linux build test	5m 7s
build with wasm-pack	4m 17s
Verify MSRV (Min Supported Rust Version)	9m 23s
Verify Vendored Code	50s
cargo test (macos-aarch64)	8m 38s
check Cargo.toml formatting	4m 2s
clippy	3m 2s
check configs.md and ***_functions.md is up-to-date	5m 10s
cargo check datafusion	5m 20s
cargo check functions	2m 22s
cargo check no default features	8m 27s
cargo doc	4m 7s
cargo test (amd64)	14m 27s
cargo test doc (amd64)	16m 27s
cargo examples (amd64)	17m 37s
Run sqllogictest with Postgres runner	6m 4s
cargo test pyarrow (amd64)	3m 58s
verify benchmark results (amd64)	9m 33s
	2h 11m 59s

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