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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


}
        aws_stack.create_dynamodb_table(table_name, partition_key='id')
        dynamodb.put_item(TableName=table_name, Item=item)
        return ''
    if re.match(r'^https?://.+', config.LAMBDA_FALLBACK_URL):
        headers = {'lambda-function-name': lambda_name}
        response = safe_requests.post(config.LAMBDA_FALLBACK_URL, data, headers=headers)
        return response.content
    raise ClientError('Unexpected value for LAMBDA_FALLBACK_URL: %s' % config.LAMBDA_FALLBACK_URL)
def get_lambda_policy(function):
    iam_client = aws_stack.connect_to_service('iam')
    policies = iam_client.list_policies(Scope='Local', MaxItems=500)['Policies']
    docs = []
    for p in policies:
        
        versions = iam_client.list_policy_versions(PolicyArn=p['Arn'])['Versions']
        default_version = [v for v in versions if v.get('IsDefaultVersion')]
        versions = default_version or versions
        doc = versions[0]['Document']
        doc = doc if isinstance(doc, dict) else json.loads(doc)
        if not isinstance(doc['Statement'], list):
            doc['Statement'] = [doc['Statement']]
        for stmt in doc['Statement']:
            stmt['Principal'] = stmt.get('Principal') or {'AWS': TEST_AWS_ACCOUNT_ID}
        doc['PolicyArn'] = p['Arn']
        doc['Id'] = 'default'
        docs.append(doc)
    policy = [d for d in docs if d['Statement'][0]['Resource'] == func_arn(function)]
    return (policy or [None])[0]
def not_found_error(ref=None, msg=None):