proposal: commands/da: index Rooch blocks on Avail

[popcnt1]

Proposal Details

For fast access data on Avail.

Approach:

1. filter avail blocks by Submitted Data list API
2. filter Rooch blocks by Submitted Data info API with AppID
3. compare expect segment hash and data_hash got by step2, record segment_id:data_info_on_avail

add blake2b_simd to dependencies

/// calculate data hash
pub fn calc_data_hash(segment_bytes: &[u8]) -> H256 {
    blake2_256(segment_bytes)
}

fn blake2_256(data: &[u8]) -> H256 {
    H256(blake2(data))
}

fn blake2(data: &[u8]) -> [u8; LENGTH] {
    blake2b_simd::Params::new()
        .hash_length(LENGTH)
        .hash(data)
        .as_bytes()
        .try_into()
        .expect("slice is always the necessary length")
}

Enhancement:

1. Option to fill up chunks if there is missing segment by other DA backend
2. Provide RPC to get/list Rooch blocks on Avail
3. Dump/Load Index to/from file