fix(dynamodb): add missing DynamoDB operations to enum (#17738)

While trying to modernize some of my application's hand-rolled alarms, I discovered that the Operations enum doesn't include all of the operation names listed under "Dimensions for DynamoDB Metrics" in https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/metrics-dimensions.html

This PR adds this missing operation names to the enum.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: varju

packages/@aws-cdk/aws-dynamodb/lib/table.ts

@@ -72,6 +72,21 @@ export enum Operation {
   /** BatchWriteItem */
   BATCH_WRITE_ITEM = 'BatchWriteItem',
 
+  /** TransactWriteItems */
+  TRANSACT_WRITE_ITEMS = 'TransactWriteItems',
+
+  /** TransactGetItems */
+  TRANSACT_GET_ITEMS = 'TransactGetItems',
+
+  /** ExecuteTransaction */
+  EXECUTE_TRANSACTION = 'ExecuteTransaction',
+
+  /** BatchExecuteStatement */
+  BATCH_EXECUTE_STATEMENT = 'BatchExecuteStatement',
+
+  /** ExecuteStatement */
+  EXECUTE_STATEMENT = 'ExecuteStatement',
+
 }
 
 /**

packages/@aws-cdk/aws-dynamodb/test/dynamodb.test.ts

@@ -1600,6 +1600,11 @@ describe('metrics', () => {
       'deleteitem',
       'updateitem',
       'batchwriteitem',
+      'transactwriteitems',
+      'transactgetitems',
+      'executetransaction',
+      'batchexecutestatement',
+      'executestatement',
     ]);
 
   });