## Description
Implement data loaders for fetching historical object versions, objects
bounded by their parent versions, and the latest versions of an object
at a given checkpoint.
By implementing an Object DataLoader, we also implicitly get support for
data-loading all derived types (`MoveObject`, `MovePackage`,
`MoveModule`, `DynamicField`, `Coin`, etc).
These implementations (particularly historical queries and queries where
the version can be bounded by a parent version) can be made even more
efficient with the existence of an index/side table that maps an
object's ID and version to the checkpoint it is part of. This change has
not been included in this PR, but we will follow up on this as part of
Object query benchmarking.
As part of this change, I enabled queries for historical objects outside
the available range. Later (with the use of an `obj_version` index) it
will also be possible to enable dynamic field look-ups on historical
objects as well.
## Test Plan
```
sui$ cargo nextest run -p sui-graphql-rpc
sui$ cargo nextest run -p sui-graphql-e2e-tests --features pg_integration
```
Run the following query -- after this change, it takes about 8s to
complete on the server, fetching about 80 objects, while previously it
would either timeout or squeak in *just* under the 40s timeout. I expect
this number to improve further once we have an efficient way to map
object ids and versions to a checkpoint sequence number.
```graphql
query {
transactionBlocks(last: 5) {
nodes {
effects {
objectChanges(first: 50) {
pageInfo { hasNextPage }
nodes {
idCreated
idDeleted
inputState { asMoveObject { contents { json } } }
outputState { asMoveObject { contents { json } } }
}
}
}
}
}
}
```
---
## Release notes
Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.
For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.
- [ ] Protocol:
- [ ] Nodes (Validators and Full nodes):
- [ ] Indexer:
- [ ] JSON-RPC:
- [x] GraphQL: Queries for historical versions of objects will now
return data even if that version of the object is outside the available
range.
- [ ] CLI:
- [ ] Rust SDK: