Bulk operations

A Bulk Operation is a set of changes applied across 0 or more records triggered via a call to the Knock API and performed asynchronously. The BulkOperation record represents the state of the operation, including recording the number of rows that have been modified during the operation. Please note here: the `estimated_total_rows` field may have a different value to the `processed_rows` field due to the asynchronous nature of the operation.