Transactional and PartiQL ConsumedCapacity under-reported / omitted

[hicksy]

Summary

ConsumedCapacity reporting differs from real DynamoDB, surfaced by the dynamodb-conformance suite (Dynoxide 0.9.13). All four are under-reporting or omission against ReturnConsumedCapacity.

1. TransactWriteItems reports 1 WCU per item; AWS charges 2 WCU per item for transactional writes (so a 2-item transaction is CapacityUnits: 4, not 2).
2. TransactGetItems reports 1 RCU per item; AWS charges 2 RCU per item, including items that are missing.
3. TransactGetItems with ReturnConsumedCapacity: INDEXES omits Table.ReadCapacityUnits from the breakdown; AWS populates it.
4. PartiQL ExecuteStatement omits the ConsumedCapacity block entirely when ReturnConsumedCapacity is requested; AWS always returns it.