Function derive_erasure_chunks_with_proofs_and_root

pub fn derive_erasure_chunks_with_proofs_and_root(
    n_validators: usize,
    available_data: &AvailableData,
    alter_chunk: impl Fn(usize, &mut Vec<u8>),
) -> (Vec<ErasureChunk>, Hash)

Helper for chunking available data.