[WIP] Add block justification support

[jakehemmerle]

waiting on a blocking sqlx bug mentioned in #147, should close #147 when this is merged

In the meantime, can you let me know if the next steps sound right?:

1. sqlx prepare to generate proper sqlx-data.json (this is blocking bug)
2. is there a preferred way to test insert/query/delete other than configuring and spinning up substrate-archive? I did not find any reference to the 10K_BLOCKS.bin file so I'm assuming there aren't test cases to test insertion/query/deletion.

[insipx]

looks good! Some small nits. Hopefully the SQLx bug gets fixed sooner rather than later :).

As for testing, there is a way. You can look here:

substrate-archive/substrate-archive/src/database/queries.rs

Line 257 in 3f09225

fn should_get_missing_storage() -> Result<(), Error> {

for how I tested blocks_paginated query, etc.

It's relatively new code with some of the recent PR's, so open to suggestions, but you can see/use the setup_data_scheme for an example of populating the SQL database with the 10,000 blocks. Also good to keep in mind that the 10,000 blocks start from block height 3,000,000. Those blocks are accessed from the test_common crate:

substrate-archive/substrate-archive/src/database/queries.rs

Line 226 in 3f09225

let blocks: Vec<BlockModel> = test_common::get_kusama_blocks()?.drain(0..1000).map(BlockModel::from).collect();

setup_data_scheme already inserts a bunch of blocks into SQL, so a good test might just be running that and then checking if the expected justifications exist 👍