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alternator: add support for ReturnValuesOnConditionCheckFailure feature As announced in https://aws.amazon.com/about-aws/whats-new/2023/06/amazon-dynamodb-cost-failed-conditional-writes/, DynamoDB added a new option for write operations (PutItem, UpdateItem, or DeleteItem), ReturnValuesOnConditionCheckFailure, which if set to ALL_OLD returns the current value of the item - but only if a condition check failed. Fixes https://github.com/scylladb/scylladb/issues/14481 Closes scylladb/scylladb#15125 * github.com:scylladb/scylladb: alternator: add support for ReturnValuesOnConditionCheckFailure feature alternator: add ability to send additional fields in api_error