A shard layout that maps accounts evenly across all shards -- by calculate the hash of account
id and mod number of shards. This is added to capture the old account_id_to_shard_id algorithm,
to keep backward compatibility for some existing tests.
parent_shards for ShardLayoutV1 is always None, meaning it can only be the first shard layout
a chain uses.
A shard layout that maps accounts evenly across all shards -- by calculate the hash of account id and mod number of shards. This is added to capture the old
account_id_to_shard_idalgorithm, to keep backward compatibility for some existing tests.parent_shardsforShardLayoutV1is alwaysNone, meaning it can only be the first shard layout a chain uses.