Delete constructor
      
      Delete({ 
    
    
- required Map<String, AttributeValue> key,
- required String tableName,
- String? conditionExpression,
- Map<String, String> ? expressionAttributeNames,
- Map<String, AttributeValue> ? expressionAttributeValues,
- ReturnValuesOnConditionCheckFailure? returnValuesOnConditionCheckFailure,
Implementation
Delete({
  required this.key,
  required this.tableName,
  this.conditionExpression,
  this.expressionAttributeNames,
  this.expressionAttributeValues,
  this.returnValuesOnConditionCheckFailure,
});