Rust

add ability to customize tokens in parser #76

Job	Run time
cargo test (macos-aarch64)	15m 8s
Verify Vendored Code	1m 32s
Verify MSRV (Min Supported Rust Version)	4m 56s
Check cargo fmt	1m 23s
build and run with wasm-pack	4m 57s
linux build test	5m 54s
cargo check datafusion-common features	2m 6s
cargo check datafusion-proto features	4m 33s
cargo check datafusion-functions features	2m 44s
cargo check datafusion-substrait features	10m 30s
cargo check datafusion features	11m 13s
cargo test (amd64)	11m 48s
clippy	6m 29s
Run sqllogictest in Substrait round-trip mode	6m 16s
check example README is up-to-date	40s
verify benchmark results (amd64)	10m 40s
cargo test datafusion-cli (amd64)	4m 29s
cargo doc	4m 59s
Run sqllogictest with Postgres runner	7m 34s
check Cargo.toml formatting	3m 37s
cargo test doc (amd64)	8m 18s
cargo examples (amd64)	13m 32s
check configs.md and ***_functions.md is up-to-date	4m 57s
	2h 28m 15s

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