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# Type of request: This is a ...

[ ] bug report
[X ] feature request

# Detailed description

I'm using localstack to create a dynamoDb table locally with a dynamodb stream and a flink application consuming data from the stream
The shardId created in localstack follows this format

shardId-000000000000-798cedd84a2953c5af70a131f8701f35

Flink expects this format
shardId-00000001592367572726-07776efd

The difference is just after the prefix shardId.
Normally the real shardId created by amazon use is composed by shardId prefix, 20-digit timestamp and 0-36 or more characters separated by '-'

The current shardId format is not valid for flink applications and it's not following the real pattern used by amazon

## Expected behavior

ShardId must follow the pattern
shardId prefix, 20-digit timestamp and 0-36 or more characters separated by '-'

## Actual behavior

The shardId follows the pattern
shardId prefix, 12 0s and 33 characters separated by '-'

# Steps to reproduce

Create a dynamodb table

## Command used to start LocalStack

I'm using docker and docker compose to run localstack


## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

aws --endpoint-url=http://localhost:4566 dynamodb create-table \
    --table-name temp4 \
    --attribute-definitions AttributeName=partition_key,AttributeType=S AttributeName=sort_key,AttributeType=S \
    --key-schema AttributeName=partition_key,KeyType=HASH AttributeName=sort_key,KeyType=RANGE \
    --provisioned-throughput ReadCapacityUnits=100,WriteCapacityUnits=100 \
    --stream-specification StreamEnabled=true,StreamViewType=NEW_AND_OLD_IMAGES


queue_name = 'queue-{}'.format(short_uid())
        queue_url = self.client.create_queue(QueueName=queue_name)['QueueUrl']
        testutil.create_lambda_function(
            handler_file=TEST_LAMBDA_ECHO_FILE,
            func_name=function_name,
            runtime=LAMBDA_RUNTIME_PYTHON36
        )
        lambda_client = aws_stack.connect_to_service('lambda')
        lambda_client.create_event_source_mapping(
            EventSourceArn=aws_stack.sqs_queue_arn(queue_name),
            FunctionName=function_name
        )
        self.client.send_message(
            QueueUrl=queue_url,
            MessageBody='hello world.',
            MessageAttributes=TEST_MESSAGE_ATTRIBUTES
        )
        events = get_lambda_log_events(function_name)
        self.assertEqual(len(events), 1)
        sqs_msg = events[0]['Records'][0]
        self.assertEqual(sqs_msg['body'], 'hello world.')
        self.assertIn('messageAttributes', sqs_msg)
        self.assertIn('City', sqs_msg['messageAttributes'])
        attr_lower = TEST_MESSAGE_ATTRIBUTES['City']
        attr_lower = {'dataType': attr_lower['DataType'], 'stringValue': attr_lower['StringValue']}
        self.assertEqual(sqs_msg['messageAttributes']['City'], attr_lower)
        
        self.client.delete_queue(QueueUrl=queue_url)
        lambda_client.delete_function(FunctionName=function_name)
    def test_send_message_with_delay_seconds(self):