Function chunk_header 

pub fn chunk_header(
    context: LocalSharedStatePackageContext,
    stream_id: [u8; 32],
    artifact_id: [u8; 32],
    family: u8,
    class: u8,
    index: u32,
    count: u32,
    total: u64,
    nonce: [u8; 24],
) -> Result<Vec<u8>>