Function find_key_values_by_prefix

pub async fn find_key_values_by_prefix<D, F>(iterations: u64, f: F) -> Duration
where
    D: TestKeyValueDatabase,
    D::Store: KeyValueStore,
    F: Fn(Vec<(Vec<u8>, Vec<u8>)>) -> Vec<(Vec<u8>, Vec<u8>)>,

Benchmarks the find_keys_by_prefix operation.