v1.1.0

Improved performance of purge_orphan_items function by implementing batch item deletions

• Replaced usage of Boto3 DynamoDB client delete_item with batch_write_item for deleting items in DynamoDB. This change improves performance by reducing the number of requests made to DynamoDB and allowing for batch deletions.
• Added internal _delete_items function to handle the batch_write_item operation.
• Added closure submit_delete_items to the purge_orphan_items function, which contains the executor.submit call to _delete_items and the delete_items_callback function.