Improve StringView support for SUBSTR #31849

Job	Run time
cargo check	10m 28s
build with wasm-pack	2m 27s
cargo test (win64)	44m 26s
cargo test (macos)	12m 14s
cargo test (macos-aarch64)	10m 45s
Verify Vendored Code	54s
Check cargo fmt	40s
Verify MSRV (Min Supported Rust Version)	7m 0s
cargo test (amd64)	9m 58s
cargo test datafusion-cli (amd64)	4m 4s
cargo test hash collisions (amd64)	14m 15s
cargo doc	3m 54s
check Cargo.toml formatting	3m 2s
clippy	5m 33s
cargo test doc (amd64)	14m 57s
cargo examples (amd64)	13m 18s
Run sqllogictest with Postgres runner	3m 31s
cargo test pyarrow (amd64)	2m 53s
verify benchmark results (amd64)	12m 7s
check configs.md is up-to-date	2m 40s
	2h 59m 6s

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