Rust bindings

Generates the rust bindings for the c-kzg library.

Based on fbef59a3f9e8fa998bdb5069d212daf83d586aa5 commit from ethereum/c-kzg-4844 repo.

Build

cargo build --release

Build with --features="minimal-spec" to set the FIELD_ELEMENTS_PER_BLOB compile time parameter to the pre-determined minimal spec value.

Test

cargo test --release

Benchmark

cargo bench