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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


asynchronous=not config.SYNCHRONOUS_API_GATEWAY_EVENTS)
    except Exception as e:
        LOG.warning('Unable to run Lambda function on API Gateway message: %s %s' % (e, traceback.format_exc()))
def process_sns_notification(func_arn, topic_arn, subscription_arn, message,
        message_attributes, unsubscribe_url, subject='',):
    event = {
        'Records': [{
            'EventSource': 'localstack:sns',
            'EventVersion': '1.0',
            'EventSubscriptionArn': subscription_arn,
            'Sns': {
                'Type': 'Notification',
                'MessageId': str(uuid.uuid4()),
                'TopicArn': topic_arn,
                'Subject': subject,
                'Message': message,
                'Timestamp': timestamp_millis(),
                'SignatureVersion': '1',
                
                
                'Signature': 'EXAMPLEpH+..',
                'SigningCertUrl': 'https://sns.us-east-1.amazonaws.com/SimpleNotificationService-000000000.pem',
                'UnsubscribeUrl': unsubscribe_url,
                'MessageAttributes': message_attributes
            }
        }]
    }
    return run_lambda(event=event, context={}, func_arn=func_arn, asynchronous=not config.SYNCHRONOUS_SNS_EVENTS)
def process_kinesis_records(records, stream_name):
    def chunks(lst, n):