Function write_encrypted_raw 

pub fn write_encrypted_raw(
    store: &dyn BlockStore,
    crypto: &dyn CryptoEngine,
    codec: &PostcardCodec,
    block_id: u64,
    kind: ObjectKind,
    raw_data: &[u8],
) -> FsResult<()>

Write raw encrypted bytes (for file data chunks that are already raw bytes).